Malicious PDF — malware analysis report

Static analysis result for SHA-256 b954ff88ab1ae32b…

MALICIOUS

PDF

70.6 KB Created: 2020-11-22 01:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1e04ddc57dbf74ec6cf747850a4e1081 SHA-1: 7ad1c9db23854ed9e0a4b424bd5f65bf74015f33 SHA-256: b954ff88ab1ae32b7e14ae1602bb9978ec027e4d5c17a00b3e2f1d771002c6ce
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 strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=beach+wedding+hairstyles+for+medium+length+hair In PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/e8631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446401/normal_5fa191eb1e8db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f9b08b73d5a3.pdfIn PDF document text
    • https://jatufajikovuna.weebly.com/uploads/1/3/4/7/134719937/kugalibozu.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/jovifigote_vijal_xomen_sazibujokol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_5f9117b91087a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497666/normal_5faff0bc274bd.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/7078953.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/jusuberu/comptia_security_501_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc855af2-ac56-4eb4-923c-6f875e7b77fd/fagukowufazix.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/android_9_samsung_j7_plus.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_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 5680 bytes
SHA-256: 2b6cacf2cebad21d0a3e55fe46a69dd11d042157c480bd067d6cb160eabe9212
font_01_sfnt_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 10748 bytes
SHA-256: 08817dfd4c79db91e3d2a4708444ec553873de8ca2e53b91661e638d936fee16

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