Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ab90a52fdff80d…

MALICIOUS

PDF

72.1 KB Created: 2020-12-25 14:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ff22e1f1bd1c137e649f4710a0e84dd0 SHA-1: ecea46f659a50440cd88daf2a4813f5084f1c0fa SHA-256: c1ab90a52fdff80d125d9c177016a97ebe9d40918c63a0de7738bacb08358f95
214 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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=center+grove+middle+school+north+dress+code In PDF document text
    • https://cdn.sqhk.co/dufadafakuti/nrgjPgi/hot_rod_lincoln_lyrics_and_chords.pdfIn PDF document text
    • https://masomubomifok.weebly.com/uploads/1/3/1/4/131406343/4032675.pdfIn PDF document text
    • https://cdn.sqhk.co/jalizovi/OUighjj/the_third_day_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/djeheuO/cake_recipe_from_scratch_with_cake_flour.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372080/normal_5fe2ae320d089.pdfIn PDF document text
    • https://cdn.sqhk.co/fasixazijaz/i1haK3O/ludo_star_online_facebook_download.pdfIn PDF document text
    • https://cdn.sqhk.co/retirijozi/0ghmDhg/luvedirotaromisejorala.pdfIn PDF document text
    • https://pikotawikeju.weebly.com/uploads/1/3/4/4/134496208/wapowinazalusevu.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/L7UjaZp/15685158459.pdfIn PDF document text
    • https://cdn.sqhk.co/pegebatanuz/gjjfahc/bedwars_maps_for_mcpe.pdfIn PDF document text
    • https://givexikiduxa.weebly.com/uploads/1/3/1/3/131398224/4127a67afe.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
    • https://uploads.strikinglycdn.com/files/52735250-7e7e-46bb-8992-03a684214d93/redupujamedizuvuzag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb2bfd6-d04a-4937-82b3-5db69c22d801/leadership_theory_and_practice_6th_edition.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_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 5012 bytes
SHA-256: 1ff10ca267a7309fd564b28fb0a70ac2e7af5b48c6f49685131bb07c4ee010ac
font_01_sfnt_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 10508 bytes
SHA-256: 76a1038b6b28329be61177d104f06e812692b83f615185df54e2fffa3bc6b897
font_02_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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