Malicious PDF — malware analysis report

Static analysis result for SHA-256 4838f47eda7b3bbd…

MALICIOUS

PDF

77.0 KB Created: 2021-04-12 08:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1f9bef9226e79ff75744c11f53c521ff SHA-1: 1833ff6e5210fe52bd329aa16600a3b7a04946d7 SHA-256: 4838f47eda7b3bbda873741ff911ed188f334356500ff561c5b5b0741f83eab5
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://xajibur.ru/strik?utm_term=the+expanse+season+6+cast PDF link annotation
    • https://cdn.sqhk.co/bibobovezave/1hdijjo/34878307756.pdfIn PDF document text
    • http://trells.space/98213151538uiidh.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/22397716876wfgmh.pdfIn PDF document text
    • http://wusator.mygamesonline.org/28284467628.pdfIn PDF document text
    • http://arevakar-travel.com/10816803073tl4zk.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/ieTdrpT/r_type_3_snes_review.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/logical_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_b20046ca7bc94361aed072e2dc146de7.pdf?index=trueIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_d0c89eb4a60e466ca9d12b4133fb46e0.pdf?index=trueIn PDF document text
    • http://kivozusemu.atwebpages.com/5305649355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37e0873-9710-4fbf-aaba-651d72d813b2/wosepidir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ca835b-40d2-46c4-8557-b25d3fbf42e1/suvifenonomexekem.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_888b5ca3589a480082cb8892cf22e6ed.pdf?index=trueIn PDF document text
    • http://legokejapo.atwebpages.com/aristoteles_etica_a_nicomaco.pdfIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_c1509c6d7bcb483c9757b2bd4a76eb5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bfc711a-a811-44ba-bc8a-3f210ede0cd5/techno_beat_electronic_keyboard_keys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11272dd3-c21a-4f46-92c1-399b67d54abb/why_does_my_logitech_wireless_keyboard_lag.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_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 5064 bytes
SHA-256: aaeffefc0df3c5ea53f8870d826db11fa5ff86bf8a063f8fc88675eb8e36903a
font_01_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 10696 bytes
SHA-256: 397d5779f343cd5c8a6cb4e5a6b1183a18ab229c58bb401d2f223ecff8643aaf

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