Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb3704e5d1a62aa…

MALICIOUS

PDF

76.5 KB Created: 2021-05-07 20:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d8fdc5bf05486095503631166732d020 SHA-1: a99659fd110a757cefd6fd5bb7dcb6871c572fad SHA-256: 2cb3704e5d1a62aa6a1e1f16d067eb8fc35711b147dec0d07ee0fa18d1fe4716
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to Lexus car models and PDF generation, likely serving as a lure to disguise the malicious intent of redirecting users to potentially harmful content.

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
  • 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://seumenha.ru/strik?utm_term=lexus+rx+350l+2020+interior PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484093/normal_6044d1c2a22fb.pdfIn PDF document text
    • http://wiinorama.space/genurakazurefawefugbt5hu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478947/normal_5fc612d2cc4bc.pdfIn PDF document text
    • http://f13x.xyz/belhaven_bay_surf_reportc2qqq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_603fc15646b34.pdfIn PDF document text
    • http://ourfanz.com/87817439145lmkt6.pdfIn PDF document text
    • http://faxozulakevosos.iblogger.org/43440568198.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/981186af-c978-440e-b2df-e6c13fa4f2f3/81533480822.pdfIn PDF document text
    • http://nedifig.epizy.com/21959513456.pdfIn PDF document text
    • https://7031c68c-cf47-488c-b9bd-b344696616f5.filesusr.com/ugd/51e9e9_6675c0eaa5aa4187abf1600412ae30b5.pdf?index=trueIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_e4699e09132d4751a03274f6f753b69b.pdf?index=trueIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_61722d57716d4e5cac6e5104f2cb57c9.pdf?index=trueIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_233d33da8f7a4369a9787e15eb9875aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc66b6b5-5917-453d-bc65-8dbc7ba3b654/how_to_improve_english_speaking__writing_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12e83ca-335f-439d-b690-43bfad906f0b/64874193638.pdfIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_296ce214b94646ceb8e0cb3cf39aebdf.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_0973b7296ac84f2b9b5bddaf064e885c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 5040 bytes
SHA-256: c041168c671300dffca6adde3d7bec6e296bdc1185ef84a568e3426c823ddf54
font_01_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 12480 bytes
SHA-256: 52badf5250216e9b21b9ed3e5f6945d5f4d9a26f96f7cfc2152a3d23a5c41fa8

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