Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd770721a757725…

MALICIOUS

PDF

78.8 KB Created: 2021-03-22 09:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 586d535d910f4f1aa836dc5754989fbc SHA-1: 43a873fac5bf367da9e0b16f8915cad997951f81 SHA-256: 2dd770721a757725a32aa9f8d1b847672351d6fd9b4e9666a495721d68fd69a7
214 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting services. This suggests an attempt to lure users to malicious sites, potentially for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/wix?keyword=module+3+study+guide+world+history PDF link annotation
    • https://pazixexawa.weebly.com/uploads/1/3/1/4/131437352/doladenuxufatuf_sirobajewile.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/ejfIlic/cooking_joy_2_app.pdfIn PDF document text
    • https://vidufatow.weebly.com/uploads/1/3/1/4/131438098/xozuditeba.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/NYjhmgh/5473011587.pdfIn PDF document text
    • https://sevozinevuzejok.weebly.com/uploads/1/3/4/9/134903388/2426598.pdfIn PDF document text
    • https://bisetegu.weebly.com/uploads/1/3/4/5/134528498/kogasimiz.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/eBibge3/good_drift_car_forza_horizon_4.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/cjeigdN/ladamubexa.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/jbYgctF/christmas_run_park_trails.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_601199196c95e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381752/normal_60001688d9e35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_e50dacb9aa134cc5b0614f3b321c78f2.pdf?index=trueIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_39c1a056e7c1496585c086a653a48191.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_09f6a5501fde42c29a7321d81e1b5efc.pdf?index=trueIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_8990792e0c704e79a1e4324329b1d1fc.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_86d2c1943bd94e5dabd3f2f43aaec0b2.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_1eceae55c0484be68f889bf90bc9299a.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_8af2f6e7a1cb4daa8dd02dce354ad0cc.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_3ddb86e3b1054e0ca472373f5317aaae.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_bac710b6a80e49a480f00f37f0989f4c.pdf?index=trueIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_5f54adb1b483406c95b1049d276a8f07.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_86dc2bff9cb74368b6b3140cd8d9d8d7.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_a321ca8e404249acaf20b3c8bef83f31.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_62c8158fc00d4769bf03f35d7ad4de3e.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_332b5b6f4a044769934d0448c07d52ca.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 5240 bytes
SHA-256: 1ec0c0f3b73b1d7051858aadc10f4717885f163d9ce2275d9a1258bec09b048d
font_01_sfnt_off0001090e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 10764 bytes
SHA-256: 0aa862a7915286c3c4a9e1d1ec895845ad9ae76becbd25f30055e6bc5e070f5a

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