Malicious PDF — malware analysis report

Static analysis result for SHA-256 a936cf02dfb7584d…

MALICIOUS

PDF

73.3 KB Created: 2021-03-30 01:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a441514d1acd693086e1b3cf4acf892a SHA-1: 59e0bc69e3ba6900dfa926634142ad4a897439ed SHA-256: a936cf02dfb7584d2ddcf00be1f2ad2b36efb19244e2ae87f8fe5a25a3e3358c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://dugedepap.ru/wix?keyword=poketrack+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369900/normal_6029c37c3f941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_6027c8f21f2b1.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/tijevizawafapuwixizaramig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484812/normal_60590a56a2327.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/8364172946.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459463/normal_5fca0b60badfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/easy_pub_quiz_questions_and_answers_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a21b42f5-21bf-4593-8928-3750dcf216c9/budenurekoxidilenawidokuv.pdfIn PDF document text
    • http://bapomeguradoka.rf.gd/fowedilopezizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4becc072-5fff-4d65-8a84-38742f533c57/15540367085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b15b34-37a9-497f-8171-551d35c0ce39/how_to_start_a_freelance_writing_business_with_no_experience.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/zekelukatimolagadif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc8b0be5-daad-4852-b726-3159b67e9e08/how_do_you_write_a_self_evaluation_comment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac6068b-644f-4135-b9c0-417b76a52871/65616821904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49100c3e-7440-40bf-9da1-0613c34b0748/what_is_descriptive_writing.pdfIn PDF document text
    • http://bovimobutenivu.rf.gd/98189624832.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 5048 bytes
SHA-256: 5b8c58209f8f025747229a3b0ecec59f0ebe002a9ffd5bd149b6af5adfa0711e
font_01_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 10960 bytes
SHA-256: c368e6b1c33751b8c9dc9e58e57fb7ccb429302b7a6869395d8c685188c15fe5

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