Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3fe89b1eb0fb86…

MALICIOUS

PDF

99.0 KB Created: 2021-03-04 14:32:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2f4250dc30814764272c4d70950ae20e SHA-1: 05ceb77ecc1044ae17138b3fc84659e3dc6a5465 SHA-256: 6f3fe89b1eb0fb86293089226e1f672d85ffbdfc8f124cda5663bd6aadd72bef
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=job+shadow+essay+template PDF link annotation
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/jobidosivotajipuwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fcbf6ac57b56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5ff92c40a6403.pdfIn PDF document text
    • https://nubiduxabegi.weebly.com/uploads/1/3/1/8/131871606/rivedupeteru.pdfIn PDF document text
    • https://mokabeninenaji.weebly.com/uploads/1/3/4/0/134013120/35d27333afc40.pdfIn PDF document text
    • https://xepawonim.weebly.com/uploads/1/3/0/7/130776577/medixawew.pdfIn PDF document text
    • https://livabawixegi.weebly.com/uploads/1/3/4/3/134320323/dijisoze_pegafisepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_ee18ce74cdeb4fa6be68a9e6bae61cd9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ada768-a970-427f-a0bf-0efc0b5f1d30/88993296805.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/cat_dog_hd_images.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_510c07ac7b4f497ea6a538c96f2e2c14.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_fd424f2553294a9da9e74f9b491d278d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc22d3b-daf7-47d9-bc1a-ccce602b1fe0/64556488612.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/different_types_of_landforms_images.pdfIn PDF document text
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_faca8400024e40479e3785fbe7acb905.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa5c90c2-b53c-44c2-bd2c-482647b50795/75720549049.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/all_bollywood_movie_video_song.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_fd0baaf219bc4adba5e42f09b6394a3e.pdf?index=trueIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_df8c89aa8b43410991ed20871bce6722.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/speed_test_ptcl_dsl_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/50750917397.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_c70529054c8a4b35a73a56a0b13e385a.pdf?index=trueIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_62c1f1ab06654a62919f84b7330e7bc5.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_off000146ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EC 5428 bytes
SHA-256: 9cd582678d69fdbccea7996f31a018758cf7466c7fd4f6365c05b5f6c21a8996
font_01_sfnt_off0001594c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594C 10996 bytes
SHA-256: 2cc54b96f1c1983f93cf3c648607ba6f3b65bcc631a3c13b940d97e80e1c7604