Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57666b5eefb4b38…

MALICIOUS

PDF

71.9 KB Created: 2020-11-25 18:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35766d50774621a79606e1d39eb8cb66 SHA-1: 6e4fba5490ddd952112721b91e4c20f026af496f SHA-256: e57666b5eefb4b38a95862bd68ad369b497ba500f022b4b85f3c33bdea04af38
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The primary link directs to 'traffmen.ru', indicating a malicious redirector designed to lead users to further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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.
  • 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/strik?utm_term=grade+4+math+textbook+pdf+download
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/2b69844efea.pdf
    • https://kijatuvoriwoze.weebly.com/uploads/1/3/4/3/134352029/7402403c.pdf
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/nabelebefawedamal.pdf
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/ef0513a2902.pdf
    • https://majizozu.weebly.com/uploads/1/3/4/5/134598595/7263755.pdf
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/aa87fd2767.pdf
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/9373972.pdf
    • https://lakiromepokina.weebly.com/uploads/1/3/4/5/134589127/saduxogijegeref-zutuwalere-kutevogake-febixunabel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ef63b5b8-c62c-4f62-a8ba-34ac392abe6c/tfd_supplies_earbuds.pdf
    • https://uploads.strikinglycdn.com/files/fabcffb4-5848-43d4-8a4f-6bd587a8209a/fission_reactor_minecraft.pdf
    • https://s3.amazonaws.com/litunux/anticancer_medicinal_plants.pdf
    • https://s3.amazonaws.com/jagux/biometrika_hutan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf7.bin
ab28ca5c8735ed8e747c7d3387ce882f058fb10818f145550b66c27a4975562f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF7 5328 bytes
font_01_sfnt_off0000e00c.bin
48d9c69ead085733091a835ad659a70883fd786131b8f8f32c6b5f9385cde40b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 10852 bytes
font_02_sfnt_off000104f3.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 4324 bytes

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