Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0ab3a0cebb58c7…

MALICIOUS

PDF

69.0 KB Created: 2021-02-20 01:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 31e6a2ef471ea3e32dd5fabf1b842ecb SHA-1: 91cae746a5869a8d67e6d8aa8ecfb25057be575b SHA-256: 3a0ab3a0cebb58c74c1fa75393ee8c59f6330a2a0c4eb23a3ce4c9b22c69271b
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://bologen.ru/strik?utm_term=dan+simmons+hyperion+audiobook PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461516/normal_600118c26389b.pdfIn PDF document text
    • http://politach.com/groesten_haus_pack_a_punch5q6zb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490519/normal_5fc9ed7b93b78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_5fd93f645e906.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/jaie0jg/gafoxuxesutupesisexosi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476150/normal_60047ce62bfaf.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/jbgdRZB/nda_exam_2020_answer_key_set_d.pdfIn PDF document text
    • https://cdn.sqhk.co/vegubefeno/dOienP5/ocoee_river_whitewater_rafting_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/pawijilabu/hfgcjaX/243438557.pdfIn PDF document text
    • http://storedubai.shop/bandeya_hd_song_free4d5h5.pdfIn PDF document text
    • http://shoop-fk.ru/3d_heart_mobile_craft6xzv1.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/gfWheIV/62181851704.pdfIn PDF document text
    • http://fabulouss.space/xovadorir16rmn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482002/normal_5fdc43668c59a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402706/normal_601e2bda8ec83.pdfIn PDF document text
    • https://kadeborejegan.weebly.com/uploads/1/3/2/7/132740978/f9c950ab1a0ddd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5fd64735f2977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470837/normal_5fd0620c1f467.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/AhmicJQ/bike_stunt_3d_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/zISKOjj/minukonujedowukawowe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 5472 bytes
SHA-256: 99c4df9e25504a42af7388e978dd50a306c5b638de7cf28c2605608c528decd9
font_01_sfnt_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 9984 bytes
SHA-256: 6a8f08b97a65a0b52bfa05254b0096cce264961bccf1f136f21163d217552b09

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