Malicious PDF — malware analysis report

Static analysis result for SHA-256 69bb7d86298f6dde…

MALICIOUS

PDF

78.2 KB Created: 2021-04-05 12:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c544b226d418c98131243828ca80f6c1 SHA-1: 39863bbaf03e4a78fa1222bfe037c9aa94e22359 SHA-256: 69bb7d86298f6dde3fff3d2662622a415ae70a1ee9d81d2b16e431bfa7132130
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body is heavily obfuscated but contains references to 'Vascular system in plants pdf' and the authoring application 'wkhtmltopdf', indicating a potential lure to disguise the malicious intent. No scripts were extracted, but the presence of numerous external links suggests a redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://maypoin.ru/award?keyword=vascular+system+in+plants+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458421/normal_605928fb7f67c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_60526a1831de0.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/28630666064.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwapusumoge/BgfxhfW/83262000401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379859/normal_5fda95d20d117.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/w7rygeK/1914051959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486192/normal_6064199e172e2.pdfIn PDF document text
    • http://valuburikodajad.medianewsonline.com/ielts_reading_sample_answer_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/h0geh48/23733962436.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/sic1hgs/millipede_arcade_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_606a77c598de7.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/e00zEia/kutajofo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e05bdd54-7536-4db1-b7ed-110d7b12163e.filesusr.com/ugd/dd5a80_5804d32ebd5345ef844c7a8e126383bd.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_594621f66c9c414d8fd3bf40cb0ca627.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_64f73b3470f042f7886a803c9c957deb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wunojipu/us_army_winter_uniform_korean_war.pdfIn PDF document text
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_8b382043e0a240b39a071e38022f453d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/11063768307.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/webasto_heater_troubleshooting_codes.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_561bd590357344dfbf8fc345e3a12831.pdf?index=trueIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_b856c22285074db0b7745c5b3f15042e.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_6d564f09f2514539b3572814accd2bf2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/spelljammer_add_adventures_in_space.pdfIn 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_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 5368 bytes
SHA-256: e3dfd06034cc87087772f8049e21d7efea91fb862e007b515d0a14316f649676
font_01_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 11304 bytes
SHA-256: 584fc329b1eb5dc718d943279f3df1036ad0f16bb2a6b00bedaeccdf99a4ef02

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