Malicious PDF — malware analysis report

Static analysis result for SHA-256 51eb530e4ee55d31…

MALICIOUS

PDF

77.0 KB Created: 2021-01-02 21:26:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8515eb387504edb34747f2e20c142ea4 SHA-1: 77a675b75744283adea67899ba15ed9712f4c6e0 SHA-256: 51eb530e4ee55d31f0cf143f7d88ee114fd5ffcde9304b36f4aa6b5958be56b2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan threat. The document contains numerous external links, suggesting a link farm or redirection to malicious sites, with one prominent URL being `https://trafficel.ru/123?utm_term=avast+license+key+crack`. The heuristic `SE_CALLBACK_LURE` suggests a callback phishing or tech-support scam pattern, further reinforcing the malicious intent.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafficel.ru/123?utm_term=avast+license+key+crack PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5f8df320b3725.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382782/normal_5fe58e7c7631a.pdfIn PDF document text
    • https://terowibew.weebly.com/uploads/1/3/4/3/134370771/tazep.pdfIn PDF document text
    • https://cdn.sqhk.co/tabawapizak/ccgixgi/dictionary_italian_spanish_translation.pdfIn PDF document text
    • https://degitetebumike.weebly.com/uploads/1/3/1/8/131857056/2982177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f87579b957d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fdba7f86d012.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382966/normal_5fe0f68fcfcb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_5fb9c800e367f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f8d84efe7856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_5fbf5df3d5a6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_5fdb71a749626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476943/normal_5fc88387896a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5f9d01a766c56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5f9b64c644b7d.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
    • 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_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 4684 bytes
SHA-256: 4ade79fa53fa057027185307f0620eadb29292f4cd60d9260be102bee0056b9f
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 11000 bytes
SHA-256: da5783edc4336b6897ea5944cd4651ae83a46a84941438cabe2420eb98901130
font_02_sfnt_off00011920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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