Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f5be1d2af41e32…

MALICIOUS

PDF

97.4 KB Created: 2021-05-17 03:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 43d87848ff4bd6a2672e11b508634b98 SHA-1: e74ac4c9a399a6c566297001a3c21525c9b5a080 SHA-256: 41f5be1d2af41e320d71175b37210e44cceb89db8187134424bb99bde0a0aa5d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm for SEO manipulation or to distribute further malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of numerous external links suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://resalured.ru/strik?utm_term=world+of+darkness+books+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459320/normal_60674789b3ecc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384460/normal_5fcea5a4ccf84.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/bifunimazujuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501514/normal_604b38610d24f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446283/normal_5fd79ebe5cdf3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465930/normal_5ff6c270a8c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_604d49d139a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_606b3a720f4a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426679/normal_60520a0a5d15f.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/melegikotoma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_d667586823844fb2b71e2cc9cfa8d396.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/kuxefanibuvizedafelu.pdfIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_079f4aad2b4a4f6d907833547f2a1adc.pdf?index=trueIn PDF document text
    • https://dcd55a6f-f4d9-4ab7-9ea0-0dac4ffa5d6f.filesusr.com/ugd/f7cbe4_1a6f0e6980d840d0803eab2cfcf36ccd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/wotegatog.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_f9b14b71594f4e5e9590dce40ae40b49.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satuja/xoguvazerutavebijoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/can_i_stream_xfinity_through_apple_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/missguided_black_bardot_fishtail_midi_dress.pdfIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_b74aed47422c4ff18a681e6f6dd0d527.pdf?index=trueIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_8162a4431b3f43a88a7ae6efba6569f9.pdf?index=trueIn PDF document text
    • https://c5b3e1fc-3b55-407d-a8d9-2bfa6c9015c1.filesusr.com/ugd/6df244_aab1a71665a64201b74e35e70bb29593.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_44afbab78d104b1c9b20d063f26628b0.pdf?index=trueIn 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_off00013265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13265 4780 bytes
SHA-256: aca4571d29e271c897eb9360fa3eb88050885cec309c1660840cf37170a38073
font_01_sfnt_off000142bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BB 11560 bytes
SHA-256: 84b657b7e426231c81e9d99add51449112594e93ecdc390022e977f94220e974
font_02_sfnt_off000169dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169DC 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230