Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe94067eac938ed…

MALICIOUS

PDF

76.8 KB Created: 2021-02-28 06:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1c13040440dd807b27da4b94d18402b3 SHA-1: 75367045d780c5a41a0e3c22bdf7f163e16331dd SHA-256: ffe94067eac938edf3488f668ebe5e942b4aa720bb610d0c9391d071eb7b76d6
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are hosted on disposable domains or redirect to malicious infrastructure, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious websites or download further payloads. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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
  • 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.
  • 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.
  • 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://dafemum.ru/123?utm_term=how+to+analyse+leverage+ratios In PDF document text
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/wumotizeg.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/witanuz.pdfIn PDF document text
    • https://lovizedisar.weebly.com/uploads/1/3/1/4/131437361/xitinonodoxudo-jowufuwejedigu.pdfIn PDF document text
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/juxenugosamoviwavi.pdfIn PDF document text
    • https://padokerasuwo.weebly.com/uploads/1/3/5/3/135319223/d6886cd10a582be.pdfIn PDF document text
    • https://cdn.sqhk.co/mazonixun/iJjjhfu/welusegojosiporori.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/eje4lhf/karikuruwir.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/i5DFSgi/surah_shams_translation.pdfIn PDF document text
    • https://joxisewegiwazev.weebly.com/uploads/1/3/4/6/134669132/sewojex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_60137bfee88d4.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/sirebumodef.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/Vhehehi/how_to_push_on_ragdoll_engine_roblox_pc.pdfIn PDF document text
    • https://pipefedib.weebly.com/uploads/1/3/1/3/131383483/xirivisosa-xufepiruzalub-bepas-nebijinekiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/niporofez/cash_book_template_for_small_business.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/vepupinagitususuberen.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/bat_box_hole_size.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_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 5068 bytes
SHA-256: 1caa9c31cd2175eb7ce7d788dc71930440b3c6574223d379925687039a703379
font_01_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 11000 bytes
SHA-256: 49155a2eae9835f97b95e8e0de14b7a7b5274d7e777682075f9f8f5f13d2ad8b

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