Malicious PDF — malware analysis report

Static analysis result for SHA-256 295a51ea9f2f3ab3…

MALICIOUS

PDF

71.6 KB Created: 2020-12-31 04:03:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cc85870f4c6e0ffe10973fa6a83899bf SHA-1: 71f32a99031121f1013039dc68298051a014862c SHA-256: 295a51ea9f2f3ab3623014ac481b3aeccc0416a51463c7c6f25f893307b389ea
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, likely involving the redirection of users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafffe.ru/strik?utm_term=spider+solitaire+rules+objective PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8758055755a.pdfIn PDF document text
    • https://cdn.sqhk.co/romumoxoleno/hwiiSja/no_sim_toolkit_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454299/normal_5fae3bc643e15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405945/normal_5fca4dbd272ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5fbf3e1fa5b0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455403/normal_5fe1067023c8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f87ccdcedd3b.pdfIn PDF document text
    • https://fimopoki.weebly.com/uploads/1/3/4/0/134040487/9e83d318560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_5fda505aefb7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419836/normal_5fe3b9300026b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mokamoba/zogivuruja.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/dekijutesewezesolora.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/10874255400.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE92 5224 bytes
SHA-256: 6e79ecb3fdae3e729db9b282a13efdc480b3dd4ef72d2035cd4a15dc0fcfeb6b
font_01_sfnt_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 10228 bytes
SHA-256: 43abf3f823cb5c15ac96cdbec8dd320e8c8e4f6a630c0a4ed32c5f43411177e8
font_02_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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