Malicious PDF — malware analysis report

Static analysis result for SHA-256 a979cec7ec5cb1b3…

MALICIOUS

PDF

75.9 KB Created: 2021-06-06 10:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f52bfc38684d8d1ded381f6447b991ad SHA-1: f252d4651e42295e04b5d426e6e961dee2585388 SHA-256: a979cec7ec5cb1b3a216c04e5f44a5d7088c448f53ad71930de1b88211b1bbb7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/pbw?utm_term=the+art+of+leadership+george+manning+pdf
    • https://static.s123-cdn-static.com/uploads/4485329/normal_6004a5ac175b6.pdf
    • https://cdn-cms.f-static.net/uploads/4373797/normal_603e58b14f0d9.pdf
    • https://cdn-cms.f-static.net/uploads/4488322/normal_60493410e7df2.pdf
    • https://wawedubogefolik.weebly.com/uploads/1/3/5/3/135391715/3829279.pdf
    • https://cdn-cms.f-static.net/uploads/4421039/normal_605689502893f.pdf
    • https://sulabejo.weebly.com/uploads/1/3/4/6/134689147/rabegeperime.pdf
    • https://tidekomix.weebly.com/uploads/1/3/4/4/134441433/b77b876.pdf
    • https://static.s123-cdn-static.com/uploads/4408976/normal_6002c5fe7a31d.pdf
    • https://pukadove.weebly.com/uploads/1/3/4/6/134694451/7440787.pdf
    • https://cdn-cms.f-static.net/uploads/4421209/normal_5fe6e5559a04b.pdf
    • https://xavubetikobu.weebly.com/uploads/1/3/4/4/134474291/eedf5bbedc7b.pdf
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5ff261c73418a.pdf
    • https://cdn-cms.f-static.net/uploads/4390680/normal_604d3cf98c33a.pdf
    • https://static.s123-cdn-static.com/uploads/4369665/normal_5fdfb20c1e47d.pdf
    • https://static.s123-cdn-static.com/uploads/4372982/normal_6000aec8e9bfd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0b85d752-7cc9-40eb-b8ae-751accae90dd/the_red_pyramid_egypt.pdf
    • http://refarumiba.pbworks.com/f/99911142774.pdf
    • http://morabef.pbworks.com/w/file/fetch/144628368/how_much_is_a_car_wash_at_shell_gas_station.pdf
    • https://uploads.strikinglycdn.com/files/77e5d7b1-3e60-471d-927a-ade652497a6b/7554575663.pdf
    • https://uploads.strikinglycdn.com/files/9640a9b0-e326-4e4f-a4fd-6c6f599fecfa/hopper_3_installation_diagram.pdf
    • http://gogoporiwo.pbworks.com/w/file/fetch/144665448/tinixiwulamoraralu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf0.bin
33be92fdafee2d1978a7f3e10e2f42977384bbdd8938af652cf1f6135811e230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 5404 bytes
font_01_sfnt_off0000fe28.bin
339d86871b5b3f8d822284856a304de2a1b3b3819e39b62241bae2c64a8b7431		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 10516 bytes

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