Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13344259ff1e3e4…

MALICIOUS

PDF

136.3 KB Created: 2021-03-20 00:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 96ae7d9f5e0aa34ae221cd78e3eba51d SHA-1: 36fc749ca1b39efe9cbbb1e962b4ecea11409228 SHA-256: b13344259ff1e3e46f095a49c547094360b52aaa7b8a9b8e90e27595f48aa9ff
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or phishing sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://seumenha.ru/award?keyword=deepmind+alphago+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413474/normal_601772da658b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_6014e9ae8cf9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_6018fa0acf5fa.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/lejagagomesowugif4f771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495558/normal_6035f903bef56.pdfIn PDF document text
    • http://filemarker.store/kaxijifofapuno2wdnm.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/bosch_automotive_handbook_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476420/normal_6030414923c42.pdfIn PDF document text
    • http://health-top.ru/python_for_loop_break_continue_passe8i8e.pdfIn PDF document text
    • http://decideyouself.fun/ipega_controller_not_working_on_windows_10vmrmw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_7214ea1a64e84c7998db98193fe9ba7f.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_e044d714d8ae4f358511c576a20223c5.pdf?index=trueIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_b9e0b0d0bde248b5a8654a4c348532b8.pdf?index=trueIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_40784cc5ae8c44a1ad22294b4784bc18.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_f420ca1ae5b14ac7b5a8a28e4535a35c.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_9c65c2a3f0fe422e95e57424133d726e.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_105374f256a44cf4b93553b9961e4550.pdf?index=trueIn PDF document text
    • http://pujumek.myartsonline.com/85423411564.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_cfdbab0477764e5e9feb602775cc4ca1.pdf?index=trueIn PDF document text
    • http://budokukikaririd.rf.gd/75604419773.pdfIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_e34cec1a50ae4df987f3141bd34fd114.pdf?index=trueIn PDF document text
    • http://dajizipazubeva.epizy.com/darkest_dungeon_curios_spreadsheet.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_off000157ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AB 41584 bytes
SHA-256: b6fc66627dc899411e70f6a6a83b5e3bca4dbb36d3261d37d9801e38efc0a502
font_01_sfnt_off0001d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8CA 5180 bytes
SHA-256: fb2a8f9451c1ef508f4e4a953cb7bd6eb772ab5f2655e07021b2e8e1f4d8e3da
font_02_sfnt_off0001ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA4D 12532 bytes
SHA-256: e49ca69ed8ad8b3f75dc8c8fbe8719a29d78647220c8410305604f6dbb112bbd

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