Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8cd747fa74de4f…

MALICIOUS

PDF

64.3 KB Created: 2020-12-30 19:29:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 07ce02699a44b87480ef52b6737aa9f6 SHA-1: e9017fdf82471ebc1ebfb5445ce2bc8c40bf5ac3 SHA-256: 7b8cd747fa74de4f93587e0bc0628cb6e3aeb8d9466b3ec8933d188deb4367a0
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector (cctraff.ru). The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm designed to drive traffic to potentially malicious content. 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://cctraff.ru/123?utm_term=geometry+transformation+composition+worksheet+answers+key In PDF document text
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/828dccfd.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/9398548.pdfIn PDF document text
    • https://temevukovekolax.weebly.com/uploads/1/3/4/6/134688950/wuwuvoxibibetajato.pdfIn PDF document text
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/eec4b0c3f0.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/a3a7f9ef4.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/nelizenejakarug/top_king_shin_guard_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/62835941798.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/dolozoje.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/33947697978.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/90187083065.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/pimiento_capsicum_annuum.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/bugs_liker_apk_dow.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/wapebujulapixaranovudebub.pdfIn PDF document text
    • https://s3.amazonaws.com/degerutisig/ronap.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_off0000c012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC012 5512 bytes
SHA-256: cb0c0b030eca682efd7e9a9313d2c723d3c6c52e9db661e56564057f4b099d1e
font_01_sfnt_off0000d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C5 9704 bytes
SHA-256: 9115f8134278ff22bf9f74806ae80ab2fe19e6236c8b64ea4c242c6ad75a24a9

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