Malicious PDF — malware analysis report

Static analysis result for SHA-256 265460a37f9645ed…

MALICIOUS

PDF

66.1 KB Created: 2021-01-04 15:11:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 647df2b53280b8f20da640a90db88d87 SHA-1: 4ccb5519bcc69a46537d171cc2e5ff8e8fb8567d SHA-256: 265460a37f9645ed3a0a6c3097c56fe97ad8b1da8f467cdf370dd6f0dcc4e89b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests an attempt to direct users to potentially harmful websites for phishing or malware 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
  • 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.
  • 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://traffmen.ru/123?utm_term=legend+of+zelda+a+link+to+the+past+rom In PDF document text
    • https://ronizizuvuf.weebly.com/uploads/1/3/4/7/134707383/a13c44c93.pdfIn PDF document text
    • https://latifaxegorur.weebly.com/uploads/1/3/5/4/135400737/6864070.pdfIn PDF document text
    • https://dironirodog.weebly.com/uploads/1/3/4/7/134760169/danonezenodox_kexalavagarawif_sefebitevixine_jelogedela.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/36ce75ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_5f8a24c97c6a5.pdfIn PDF document text
    • https://sodumixiseto.weebly.com/uploads/1/3/4/3/134311801/lovedarijokuwi.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/jezekemunidup/australian_prescribing_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/nuvolukisijetevelijokovow.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/nomotol.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/gipavadosuvexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/525fd01e-763f-476a-adf4-2d100035c971/make_it_to_me_lyrics_grouplove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f133a866-542c-44bc-a369-90ad2bda24d4/jikavubebuwikesijiniwubav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4239f2-4035-4ed6-9971-a408f70da69b/osmosis_in_potatoes_practical.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_off0000c6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E7 5512 bytes
SHA-256: 349fde0265c393c0a2555437e7f5d5cce82fd9467be9d1709323170fb8fe00cd
font_01_sfnt_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 9904 bytes
SHA-256: 7da35de645fa9620e25516d5261e578b4fdbf5159b6ab7e4bda9b80d4eeb76ca

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