Malicious PDF — malware analysis report

Static analysis result for SHA-256 642495ca3ab67150…

MALICIOUS

PDF

67.2 KB Created: 2021-05-01 19:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e5a52a5b684384285b88f1ef44056c7d SHA-1: 81d61c260a4278f4943c29081f14b5c61c95ed73 SHA-256: 642495ca3ab6715023feff6ca9d02b6d57652fe9357cc9e7e34fae3281c058dc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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
  • 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://maypoin.ru/strik?utm_term=2005+nissan+pathfinder+for+sale+ontario PDF link annotation
    • https://somalinoduka.weebly.com/uploads/1/3/5/3/135392385/disotajazudun.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/dagipuw.pdfIn PDF document text
    • https://pivazadigemeza.weebly.com/uploads/1/3/4/6/134642233/7872604.pdfIn PDF document text
    • https://vigegenatiborig.weebly.com/uploads/1/3/0/7/130740049/11a90a182c3506.pdfIn PDF document text
    • http://gotesukig.22web.org/97426165419.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/90454a004a6.pdfIn PDF document text
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/zixorotizav_safonatugunofu.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/1229820.pdfIn PDF document text
    • http://boguzimaro.getenjoyment.net/food_carbohydrate_chemistry.pdfIn PDF document text
    • https://sefidobove.weebly.com/uploads/1/3/4/3/134320077/rukimepad-ronuxurobesogo.pdfIn PDF document text
    • https://muxavitegujun.weebly.com/uploads/1/3/1/6/131637584/zopajazomi.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/the_bacchae_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://danetuxu.rf.gd/kunetatobeweziwuwibop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/505dc4f2-13ce-43cc-a7be-ebc5bf78fcea/mojidunowuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d1a81be-1e30-4f23-b350-c08a760427dd/xufasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94dbbe52-5693-4aa7-ae3f-a869310c85fa/lankavatara_sutra_sinhala_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93881007-8116-441c-a6bb-4011262ac024/dunkin_donuts_latte_sugar_content.pdfIn PDF document text
    • http://wupewujivijulo.epizy.com/ninexuput.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_off0000c768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC768 5432 bytes
SHA-256: cff7e39e35b00833fb3a1e458b15467343c50ca0c74c5ee252153c461101ae12
font_01_sfnt_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 11268 bytes
SHA-256: c94d1c36b982860d05c321e6d4c4d4816961a70f52de47ab9649e23c254a38a3

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