Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ac3371e24ae150…

MALICIOUS

PDF

80.5 KB Created: 2021-01-21 11:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fe3701f63b1219553b85a2c5311aea77 SHA-1: 1368f633f2c5ccc080925bdb8f06beb5762b02ca SHA-256: c9ac3371e24ae15004b80340123c28e5cce444c56dfe74705b68448da6820e2a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains embedded links that point to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to 'fake bank statements', aligning with phishing or scam tactics. The presence of numerous links on disposable hosting and the ML classifier's high confidence score further support its malicious nature. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=fake+bank+statements+for+apartment In PDF document text
    • https://cdn.sqhk.co/pigajifaw/hgWXlhd/82224452762.pdfIn PDF document text
    • https://najabokaxosol.weebly.com/uploads/1/3/5/3/135300306/4676467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5fc6ac4a953cc.pdfIn PDF document text
    • http://kekebum.22web.org/vasemofoje.pdfIn PDF document text
    • https://zarojapejafaro.weebly.com/uploads/1/3/5/3/135347044/gelazebemeda.pdfIn PDF document text
    • https://site-1177369.mozfiles.com/files/1177369/rolling_stone_magazine_subscription_4_per_year.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_5fa057d330474.pdfIn PDF document text
    • https://site-1174404.mozfiles.com/files/1174404/nuwibelume.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/rxijUzW/swing_sets_metal_slide.pdfIn PDF document text
    • https://vobudogekatobef.weebly.com/uploads/1/3/0/8/130874620/ketetetabibosi.pdfIn PDF document text
    • https://site-1168444.mozfiles.com/files/1168444/81087721637.pdfIn PDF document text
    • https://site-1244917.mozfiles.com/files/1244917/best_desktop_nature_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/ehblESF/tajirewop.pdfIn PDF document text
    • https://wetegawufuju.weebly.com/uploads/1/3/5/3/135302163/wupuzixubu.pdfIn PDF document text
    • https://site-1176516.mozfiles.com/files/1176516/sports_logo_quiz_sporcle.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/wjfsshe/wofakejexorenevikivirujow.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/rubidokezive/mukoboburuxagemanuxax.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/50479041835.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/rosarowi.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/lagu_dj_asmara_slow_2019.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_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 5176 bytes
SHA-256: a34ae006bf6f2d1de3aab88705d7190352af4059c08a09c2d486716a2e18e2cd
font_01_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 10948 bytes
SHA-256: f53adbd8396da34be9f0214b14b555fc07d91c2ace8683b86bbe8fb54f6b23b5