Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61fc92615cefed2…

MALICIOUS

PDF

101.4 KB Created: 2021-05-05 22:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 99edb29324b52702507d40cae897040e SHA-1: cfecb34602186a8ab77b88b7d5fb0d3e10b20495 SHA-256: e61fc92615cefed2676fad5b212f06d6d120ecc81e4aa17e941591deb4af3f5e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains and hosted on services commonly used for link farms or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious or spammy content.

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://ponafet.ru/strik?utm_term=breakfast+at+tiffanys+new+york+reviews PDF link annotation
    • https://cdn.sqhk.co/fugovigul/gdggNhj/poly_poly_art_puzzle_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_606c3d716c7e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_606e7ece3b9c2.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/ji6gjVt/fodmap_guide_book.pdfIn PDF document text
    • https://nokajavu.weebly.com/uploads/1/3/0/9/130969653/6e864d0bd4d27.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/DiiQBgc/hoverboard_surfers_3d_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/tdhajgg/wallpaper_ultra_hd_4k_mod_apk.pdfIn PDF document text
    • https://rixafivi.weebly.com/uploads/1/3/1/3/131380000/9860546.pdfIn PDF document text
    • https://cdn.sqhk.co/fagisuxupinu/gfjeehi/face_mask_that_goes_around_neck_and_ears.pdfIn PDF document text
    • https://sabumamopadav.weebly.com/uploads/1/3/5/9/135957329/sizirejurezozoje.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/dhicig9/red_war_campaign_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/42HgdVJ/995454632.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
    • http://mudedomusakovag.epizy.com/1943925426.pdfIn PDF document text
    • http://tanegonezato.epizy.com/38518742342.pdfIn PDF document text
    • http://xafomemamaxo.epizy.com/1700_calorie_meal_plan_to_lose_weight.pdfIn PDF document text
    • http://futekewibebok.epizy.com/surah_ar_rahman.pdfIn PDF document text
    • http://nuloporime.rf.gd/81538926907.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_off000140b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B4 4884 bytes
SHA-256: df29a8c1dbcef1bc3b8f692a4d1202fe1d0d3c2b3b1a08c946e2885b423b9594
font_01_sfnt_off00015178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15178 12036 bytes
SHA-256: ae71fdf869b26297f0f584db55a1ffe3d8e72ee6aa5e329b61066416f11d50a1
font_02_sfnt_off00017a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A1B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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