Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16297c56c2fb81e…

MALICIOUS

PDF

99.1 KB Created: 2020-12-18 08:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4333ce4fcf81a78f873d923a343e07f4 SHA-1: 6d80d177024bfbb5b22c852a98592aef74dadf8d SHA-256: c16297c56c2fb81ec33f7a46e5a476262cefd5e03cd8800882aa06c79aef8160
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 redirector infrastructure. The ClamAV detection and ML classifier also indicate maliciousness, specifically flagging it as a phishing trojan. The document body appears to be obfuscated or corrupted, but the presence of numerous links strongly suggests a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffine.ru/strik?utm_term=sense+of+self-efficacy+definition In PDF document text
    • https://rizadubarezesul.weebly.com/uploads/1/3/4/4/134499036/laser.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/zapojer_rosavux.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/bevogawafoba.pdfIn PDF document text
    • https://sujanumijixedi.weebly.com/uploads/1/3/4/5/134501714/3555239.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/nivatizadukodisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fcec124ad06677b0d26bb2b/t/5fcfd61e78cd501b55e75788/1607456287346/kofutevozopemudorapili.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b295abffab30daadc730/t/5fcc40bc978da30c56f12a83/1607221445544/vocabulary_builder_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/dremel_16_scroll_saw_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc514788ef7301f8b2bec82/t/5fc991e7ee6dcf7e362b4baa/1607045608240/shark_attack_kills_maine_woman.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/ejercicios_de_m._c._m_y_m._c._d.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_off0001476f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476F 5156 bytes
SHA-256: 28dab5e43eb28e760c693d815d7249bf716ade596ea613875e892caeb7c2838f
font_01_sfnt_off00015923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15923 11480 bytes
SHA-256: 6a2865fa07c82820511fa537becacbcb377ef1095e9ccdbde56829db063d61ed

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