Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f15680f3ac461af…

MALICIOUS

PDF

75.2 KB Created: 2021-01-13 10:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 72e22026b3ba08aa7878bfda0a93f4cc SHA-1: d5ada15834a7d8641dc45efc3ec0d53c15b8a033 SHA-256: 7f15680f3ac461af5a20d65b52975c8d9fa67a0ab1df2165c6a24d3ff5be091c
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to distribute malicious content or engage in SEO abuse. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://traffmen.ru/123?utm_term=carb+cycling+calculator+plan In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_5fc1874f9934c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_5f9a1eaa1bb3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488135/normal_5fb9f2eeb2ec6.pdfIn PDF document text
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/7019662.pdfIn PDF document text
    • https://site-1171522.mozfiles.com/files/1171522/wemipukuxutopanewisi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5ffe959ac979b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_5f8f3f8d02ff3.pdfIn PDF document text
    • https://berizezemimuto.weebly.com/uploads/1/3/2/6/132695806/xuxetugow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5fd82ab592b66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5fdaa9b74d24a.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/lovomijelun/sylvania_fluorescent_lamp_replacement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/action_english_movies_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/pekife.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/bibliografia_vancouver_ejemplo.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_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 5068 bytes
SHA-256: 29e90adfe4363c3c9b3e4b0a16ec9de12fff0331400d528ceb75f4025a56b904
font_01_sfnt_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 10444 bytes
SHA-256: e0f1671ad95debe3b76994a6adff2c9328f86e127749da456700fcfaebe47cd2

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