Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8900fb2b79a863…

MALICIOUS

PDF

82.6 KB Created: 2021-04-07 06:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0156357d8b4bc7820f2991def7aeba90 SHA-1: ced9b48901b2117edc4be87bce43487b4281b4bd SHA-256: ac8900fb2b79a863676f376da7cb87b9c199248bab722d48b8bdce676d32ad62
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or leading users to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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=circles+quiz+review+answers PDF link annotation
    • https://cdn.sqhk.co/fogibadeku/ihFfig1/97935688066.pdfIn PDF document text
    • https://cdn.sqhk.co/sututidogo/Y3Ohghd/lesalazirupunigebitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_600f578bb4028.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_5ff76ed9e26ab.pdfIn PDF document text
    • https://cdn.sqhk.co/linaxezo/yhjgf5G/ifci_venture_capital_funds_limited.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424364/normal_602695c37fe75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_604a019ebd8cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386349/normal_600d2550800b1.pdfIn PDF document text
    • https://wavigijaburejuw.weebly.com/uploads/1/3/4/5/134588531/7254825.pdfIn PDF document text
    • https://xurarasetar.weebly.com/uploads/1/3/4/0/134096945/a0acc4d9b4c33.pdfIn PDF document text
    • https://zegikawa.weebly.com/uploads/1/3/4/6/134640481/fujupejusifojal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_d3f75765f3d84cf5812b57e27f35f02f.pdf?index=trueIn PDF document text
    • http://kegunujav.epizy.com/57173878690.pdfIn PDF document text
    • http://fipuxogililego.epizy.com/carmageddon_max_damage_trophy_guide_and_roadmap.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_2e177bb532404b4d83b3a8b2e81e4575.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_69741187ca9647a99ba752811946f934.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/me_before_you_full_movie_download_in_hindi_300mb.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/nalutajonamik.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/broadsheet_tagalog_wikipedia.pdfIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_1f1873962de14696bf3f45ff4415b65a.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_0f1e525542ca461ba240765555512a76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/55563462001.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 4836 bytes
SHA-256: fc5323a4028b6a2d8fd827d8c71d700ab56b4b7cb6cef393a9d9b94941ec64ed
font_01_sfnt_off000104bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 11764 bytes
SHA-256: 8187eae32a474446261466a57edfc9c5b2dc702bba803fc5016f1226d41a7533
font_02_sfnt_off00012cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34