Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8212775edf9fb9…

MALICIOUS

PDF

67.2 KB Created: 2020-11-27 21:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2e5b009293a4a9705578157b3dbd6329 SHA-1: bd983c6452d27294d8da6973f6a71caf120d159f SHA-256: 4c8212775edf9fb9e48fd22171f36ff520fe402046e0b060f708694d8d085dec
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a mass of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a 'chiller plant schematic'. No scripts were extracted, but the presence of numerous external links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=chiller+plant+schematic PDF link annotation
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/c1fd39cde20c9.pdfIn PDF document text
    • https://jowizixevudaw.weebly.com/uploads/1/3/4/4/134489406/renuluneriju.pdfIn PDF document text
    • https://wofalexo.weebly.com/uploads/1/3/4/6/134697980/2305288.pdfIn PDF document text
    • https://rajitogo.weebly.com/uploads/1/3/4/3/134377965/xenabunime.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/lorewuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_5f97ad4a00545.pdfIn PDF document text
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/05bdeb1d606c77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f8e3247604f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5f8a14fc46869.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/dfb9bf80-6007-4513-ab73-311917f39871/78912584610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6e0e86-5c36-496f-85cd-ea212c09f694/furajifibiterimuxamimubev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76c0bcd3-bf0a-490c-b07a-ee2ed66b830e/33736302093.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/depelis_doctor_strange.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/mujotibalago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/878ac263-7af0-487d-a387-bccfe14df609/339130827.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE61 5076 bytes
SHA-256: da77218edce6711f95df4d4ba207c52afe3f680989e5746b0a5ae67b546a813f
font_01_sfnt_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 9620 bytes
SHA-256: 050e1445c18a1716482702cdec0f2c5a0877bc725dbe3db978f052172a0cd669

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