Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a2c33b16b8022f…

MALICIOUS

PDF

67.5 KB Created: 2020-11-24 13:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 33897bf2d68c73994d4cdafa1b71ef4d SHA-1: 76afb7f861bd7f789754909c4e347e48f08343ff SHA-256: b9a2c33b16b8022f22125c2466262a26fd4815b8ffd36ca2aed8f079adf325a3
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic firing indicating it redirects to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to downloads and potentially adult content, which is often used as a lure in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/strik?utm_term=gratuit+brazzers+des+t%25C3%25A9l%25C3%25A9chargements In PDF document text
    • https://gudozegibuxof.weebly.com/uploads/1/3/4/7/134732985/zobuv.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/3433458.pdfIn PDF document text
    • https://renikafajuwigag.weebly.com/uploads/1/3/4/3/134317319/zojezatutefokumep.pdfIn PDF document text
    • https://vowufesoval.weebly.com/uploads/1/3/4/8/134885018/rinamizisigodi_gopunolegubes_lalovapoxi.pdfIn PDF document text
    • https://xuvowesajitox.weebly.com/uploads/1/3/4/6/134603534/mitujav_wutolowumas_sarufanutu.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/b02a6280-55f8-43ac-854d-62df153eb140/devinimsel_anlatm_nedir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dbab0d1-6b4b-47cd-b697-79f33f31624b/59398757931.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/gill_management_company.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea3cdc2-82cc-4f88-9efe-2f2870efc2a1/xupud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0e3f70-d639-43d2-b8fb-4524d9415e58/88254576865.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_off0000c531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC531 5716 bytes
SHA-256: 70c667d32f0d54d1d95dedfd5b0a276a2d7455d79dd49d740ff773fa256652b6
font_01_sfnt_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 12756 bytes
SHA-256: dae1f1391dc6a8d9bd15a4f21492711d110ccf89eb90c3175ccc72ba686347c1

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