Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fbb51c9ad2e492…

MALICIOUS

PDF

99.1 KB Created: 2021-04-25 04:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b72a2a0aca2327a037421d51c8ad00e6 SHA-1: de838a224f91da0cfae309419ff76ca0a5449094 SHA-256: 66fbb51c9ad2e492c77fc79c72d9eb66734f1684e8ac00241635e3815fc05da3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9990

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://xajibur.ru/strik?utm_term=tokyo+ghoul+season+3+episode+1+summary PDF link annotation
    • https://cdn.sqhk.co/nowovadizeb/6NDBcel/40796138475.pdfIn PDF document text
    • http://wordsidepost.top/cabelas_160-liter_commercial-grade_food_dehydrator_reviewsmc02z.pdfIn PDF document text
    • https://migobajiker.weebly.com/uploads/1/3/5/3/135390735/dibiriv_soseniwobawo.pdfIn PDF document text
    • https://cdn.sqhk.co/fapiwejagiz/x7TO8hd/40173181130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_60127aa911b20.pdfIn PDF document text
    • http://3gusevshop.space/80617037197qb4nm.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/gdgicjd/a_tag_knight_mod_apk_rexdl.pdfIn PDF document text
    • http://knitfqph.site/xojenusuforakanilof71grm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375200/normal_60677e09b9932.pdfIn PDF document text
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/tujepus.pdfIn PDF document text
    • https://cdn.sqhk.co/jadosoxiko/icjfmih/robot_vs_zombies_hack_apk.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_d636b715206947b28fa7af2500d388da.pdf?index=trueIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_ff081c54c0764e4e8be07cc9f71cd3da.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_312cf3ef53324d31a4a9089f821079c9.pdf?index=trueIn PDF document text
    • https://e19809cf-df80-48c1-9975-8599b001ad7a.filesusr.com/ugd/062cdf_86553df5cc174a2fbbd795ce4ea10555.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_58569629369249b18ee4c1d7c8ccea9e.pdf?index=trueIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_bfee3202b7054936a86d66330e1d35f9.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_9e8a84745cb44b629391b66f909dfada.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_e4c4132ab1dc44509d991103a28442b3.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 3280 bytes
SHA-256: e255efed5202e9f791edaaf830ba979feaeef1f6d4ca01df4a80799130978975
font_01_sfnt_off0001130c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 5504 bytes
SHA-256: 99fa1d7486ee270388e5f5ab96214b95bce66c19c2b3c090dd0b46bf869e782d
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 11992 bytes
SHA-256: 348472e0e3f4cae07f93345c1f0f438d4ff5e374f6998a7260d3b2a86e4b6a58
font_03_sfnt_off00014dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAE 16284 bytes
SHA-256: 34da47421b51ddab53ee2a838c84c495786a148359489e94eb2bf813584be4cc
font_04_sfnt_off00016332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16332 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
font_05_sfnt_off00017133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17133 2864 bytes
SHA-256: de09310d57df2a59182ff000d16c63ddd592a0fbb1268a531b99c852efa2ffe0

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