Malicious PDF — malware analysis report

Static analysis result for SHA-256 1966d6f8ce6354b1…

MALICIOUS

PDF

77.3 KB Created: 2021-04-01 15:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fbc5ff587c0744faf03bf4dd7a3e67de SHA-1: 59c45d17d883ecbd255fa06c9be560b989792d27 SHA-256: 1966d6f8ce6354b1da95d5324e087e502a7ed73f7e2c6a591f9a058ddd93b4bf
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 0.9997

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://bologen.ru/strik?utm_term=black+and+decker+bread+machine+parts PDF link annotation
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/b90ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374682/normal_5fff9890c9b38.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/crossword_puzzles_online_free_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_60185621c7b53.pdfIn PDF document text
    • http://dobofozepop.mygamesonline.org/movonixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501201/normal_602fbe7af1344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484995/normal_6020a7becbb29.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/51440451144.pdfIn PDF document text
    • http://bagezokazuraw.medianewsonline.com/buku_osn_biologi_sma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468253/normal_604f162267b10.pdfIn PDF document text
    • https://gataveboturifon.weebly.com/uploads/1/3/1/1/131164486/3733126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392474/normal_5ff4778084459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_619490a642dc4075b8f9e1861f222118.pdf?index=trueIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_6c331b723d7346cdb1eb560de3484617.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_7d2a6c2a8c0644f184fd22bc4fe9ea3b.pdf?index=trueIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_b6673256ccb64cb8bcf66740acbfbd53.pdf?index=trueIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_a39ed4d46c63465ea291078a00d4ca84.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_b5a68019d0584b19a449e0b0b01aff70.pdf?index=trueIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_af62c3f796b34afe8113b2ed7338274b.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_46f7ccc97658407fb7a6966e17f16c56.pdf?index=trueIn PDF document text
    • https://b7b9a0d4-d71d-433a-9dbc-8293b1c729aa.filesusr.com/ugd/979434_1b47030f77ae4a8da500f6dae3c42c27.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_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 5564 bytes
SHA-256: 5ffaac34f30b6a28e43ce2ad425a646c3590b3bdc520d2777011c737ce93f88b
font_01_sfnt_off00010166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 10772 bytes
SHA-256: f71e219a1da0ed9ed3feec3403389291e4f63d1b42acea51d508f1820581e28c