Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a37c2be0235eec…

MALICIOUS

PDF

66.8 KB Created: 2020-11-17 14:35:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 23df398b60155a857301f01d552fc007 SHA-1: dd07a412810bf7fddfbd87f345cc8975dd5eb481 SHA-256: d2a37c2be0235eeca27a053d61d4005e676d4259261008a271af12723defc335
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://trafffi.ru/aws?utm_term=company+accident+reporting+policy PDF link annotation
    • https://dalowosa.weebly.com/uploads/1/3/4/3/134383453/5937191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5f9e380ca1f7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408176/normal_5fa31b06624fe.pdfIn PDF document text
    • https://gaxasonazeg.weebly.com/uploads/1/3/4/3/134375181/fikafopa-rizabon-dupibilibedi-tisopamim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5f897b43248e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_5fa0ca16376c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_5f9c79532c911.pdfIn PDF document text
    • https://guwopatuzigumi.weebly.com/uploads/1/3/4/3/134334434/gipip_vemunidi_jugetadepagasi_rebadijuwoteri.pdfIn PDF document text
    • https://nunezexivu.weebly.com/uploads/1/3/4/4/134440215/0071d70.pdfIn PDF document text
    • https://lamuvoraraxuz.weebly.com/uploads/1/3/4/4/134486612/dimoba_sezevibu_rajukujupepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5f8c33b21611d.pdfIn PDF document text
    • https://mojipidu.weebly.com/uploads/1/3/4/3/134391160/pipoxuja_xaripegigan_kutipotumemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_5f8d42fec1e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f873dff909b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7f5e43-f890-40e8-a5cc-fa67200e9ec0/pabezuvamar.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_off0000cb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5E 5224 bytes
SHA-256: c59fdceab8827265e4298e83b6efc42d50744d8a61f07ec967e7b534eeb6d2d6
font_01_sfnt_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 9744 bytes
SHA-256: 5153437b68f65c044fd5a5c0972f832e7670ac007f5c134163d422827bc11fc5

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