Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f36d4f68a758500…

MALICIOUS

PDF

74.2 KB Created: 2020-12-15 18:13:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4a20d83476536e569270e1c9d337370a SHA-1: 77f1b8962b0a92375ccd777046388e38fe9aeb9f SHA-256: 2f36d4f68a758500efd796fbfc5b38c38723008e915da4260a006476d1a32e10
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or suspicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous external links.

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
  • 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://traffine.ru/123?utm_term=wow+time+lost+proto+drake+path In PDF document text
    • https://nefupoxuwuridek.weebly.com/uploads/1/3/4/7/134747690/ca75714a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496216/normal_5fd3872b91fbf.pdfIn PDF document text
    • https://virenogapugutu.weebly.com/uploads/1/3/4/6/134635416/merenazor-nilow-raleba.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/nejivupolebi.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/wolina/76586128582.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/yellow_flicker_beat_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca7c66d-7564-4853-9efe-14e1dd1cbdbb/dufilozev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebaae8d4-321c-49a4-9109-fde9194eedba/90861548356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7fb4e3f-d016-41fc-9eb7-deb1837f1696/36527614594.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/16920080941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d6326e-4920-48c7-9bb0-b67f22649062/padunefowimabafidavufuki.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_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 5368 bytes
SHA-256: 9463897b0a954c49033fb5bfb96e12240da01044153d05f7b97f8ab0afaffa5b
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 10508 bytes
SHA-256: 12c7df2ede01a8ed6159fd5a0a5810fac95c4bd94364c051f2412c52ba14beb3

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