Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1b4944469b71a2…

MALICIOUS

PDF

77.6 KB Created: 2021-02-25 19:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 160721b78f73cf4718e0c8b448dac9c8 SHA-1: 184290de181316bbbf487fa9d4592f3a085e0c41 SHA-256: 1e1b4944469b71a2481073911f3daa16645a606a17fd31f1a2341d2255af7d02
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs and the document's structure suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used for such redirection or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=option+volatility+trading+strategies+pdf PDF link annotation
    • https://cdn.sqhk.co/faroziwe/h9rQOFf/hybrid_t-_rex_city_rampage.pdfIn PDF document text
    • https://cdn.sqhk.co/wukikanas/dIXdjbi/46175088750.pdfIn PDF document text
    • http://cg-designer.xyz/436382559001a2xb.pdfIn PDF document text
    • http://onlineeshop24.xyz/buttinette_katalog_20201p47t.pdfIn PDF document text
    • https://vonufire.weebly.com/uploads/1/3/4/5/134596457/9729330.pdfIn PDF document text
    • https://cdn.sqhk.co/jixavome/Nic9CfD/59658417711.pdfIn PDF document text
    • http://fastcreditreport.info/95250651453vd1cv.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/ijxhihe/titan_2048_interface_artnet_to_dmx.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/kp1mgcR/kasobazil.pdfIn PDF document text
    • http://vanlit.ru/3225379634732pyh.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/hdjgYlT/wonepekovap.pdfIn PDF document text
    • https://relorurexo.weebly.com/uploads/1/3/5/3/135391300/zebilubutunijiki.pdfIn PDF document text
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/4008790.pdfIn PDF document text
    • https://padobijitoxu.weebly.com/uploads/1/3/1/0/131070591/larokinuwovowa-zutuwovibodet-fofegamezebes.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/concrete_nouns_worksheet_circling_part_1h6hw9.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/zhjVLd3/my_city_home_apk_allfreeapk.pdfIn PDF document text
    • http://goromeo.club/vubibuferukejniw0.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_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 5400 bytes
SHA-256: 412af6ee92815d0347d355e36e89877eca349244dd2bc4e908290ad6afcb0a44
font_01_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 10692 bytes
SHA-256: dea770d6488a45e8284b09042ac635644a520340e2af7e0627dbc615881c1ccc

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