Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d34ab009c22f103…

MALICIOUS

PDF

78.2 KB Created: 2021-01-03 15:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0feed882ceaeceed6d5ef4a86dc9b137 SHA-1: 795bc112a56b3ec94a471b6e23754492a1c311b1 SHA-256: 9d34ab009c22f103991c67ea973120a2ef208c0e42805f1d4ab5c5ef9db8016c
214 Risk Score

Malware Insights

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

The file was detected as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The PDF contains a large number of embedded links, many pointing to external resources, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

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=koisuru+boukun+morinaga In PDF document text
    • https://movamapipimopi.weebly.com/uploads/1/3/5/3/135303402/fomegijavifatuxo.pdfIn PDF document text
    • https://xavuzilutose.weebly.com/uploads/1/3/1/0/131070872/vemebatal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417426/normal_5fa31d41c1d0d.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/gEijgj3/tigutibatafumupexotugifux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc6009ae-d037-47ee-ab6c-11b42cddec02/71834184325.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/centralization_of_authority.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/road_of_the_dead_unblocked_games.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/5099579820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04288c96-1e4f-4154-a1b1-f9c35c01f1bc/rosugexuwimegekisuvovudun.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/nugisa.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/ramebemobekewijibozuti.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/simple_border_designs_for_a4_size_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7603edba-8289-470f-b9cd-805ad24fa3a2/dumbbell_workout.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 4300 bytes
SHA-256: 8bbda888b836b14256b72db6a53ec9b6707e52e21bd3136443efe671bb976daf
font_01_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 5144 bytes
SHA-256: de6e29f1f49e326285c8fd53fd2918e4d9e2940681ef2f2c095c22423d9c7312
font_02_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 11460 bytes
SHA-256: 813f425c9c876c01a4b9dd7a02f93dd251887b91bb50e2270f6dcb1d80b59a3a

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