Malicious PDF — malware analysis report

Static analysis result for SHA-256 da83f3a8c3cca7fb…

MALICIOUS

PDF

59.8 KB Created: 2020-12-24 11:21:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2cdc71514f61333bb9d4519ecf2b96d5 SHA-1: b3b1d1c2c9649ecae6b7674b7ff7d6766c1c5d2a SHA-256: da83f3a8c3cca7fbbd987d9007e9411fe85606dc4ae19cc89791e6f893c75037
214 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, suggesting a phishing or link-farming scheme. ClamAV also detected it as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards an attempt to lure users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/123?utm_term=oakley+oo4054+caveat In PDF document text
    • https://durewisopugus.weebly.com/uploads/1/3/4/3/134369166/51f08fc2ac.pdfIn PDF document text
    • https://cdn.sqhk.co/tiruxugajo/XpgjZCZ/mewefevorowubomemifadak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_5f8fd9b9da8c4.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/3262446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5fda880b5e884.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/429be1345a415.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwibagula/ZR0KUjc/zombie_wallpaper_4k_live.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5fdc193edbf12.pdfIn PDF document text
    • https://cdn.sqhk.co/gumoxixo/iejeTEC/tubekev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423133/normal_5fd6568952160.pdfIn PDF document text
    • https://cdn.sqhk.co/bitubebo/HjbK5bo/74831574828.pdfIn PDF document text
    • https://gawokuvaz.weebly.com/uploads/1/3/4/6/134656265/b0a60b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ac81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC81 5124 bytes
SHA-256: bb5b08bd7c99cd82714664b7225d0a82f768b7e174a42e98319f35abe3599432
font_01_sfnt_off0000be22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE22 11096 bytes
SHA-256: 1e14191e3d1a991280e89bb3999609842cc2324c4993f0dc31cd8455b5bb3adc

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