Malicious PDF — malware analysis report

Static analysis result for SHA-256 219366c7b146b003…

MALICIOUS

PDF

71.2 KB Created: 2020-11-11 22:35:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f3ad0ea03136bc939418b743aef77d40 SHA-1: e90bfddd6cac9779292fd8dc6ec01507c4566545 SHA-256: 219366c7b146b0038d1991cf8ff98dd71a8a8a89d4040d1d96cca6f0e677ae0c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link and a link farm. The embedded content, though heavily obfuscated, suggests an attempt to direct users to malicious infrastructure via the URL 'https://gettraff.ru/strik?utm_term=small+speaker+review'. The presence of numerous external PDF links further supports the malicious intent, likely for SEO manipulation or to host further malicious content, aligning with a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://gettraff.ru/strik?utm_term=small+speaker+review In PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/6070922.pdfIn PDF document text
    • https://duvirimak.weebly.com/uploads/1/3/4/6/134603536/xupis_nubodag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480598/normal_5fab0ead9faf7.pdfIn PDF document text
    • https://nuzixusimupe.weebly.com/uploads/1/3/4/3/134306281/fipebasekupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5fa800eeba65c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_5f9cc55849a56.pdfIn PDF document text
    • https://guzudefadeberis.weebly.com/uploads/1/3/4/6/134639139/pozovarutikoxaxota.pdfIn PDF document text
    • https://palifeselaliku.weebly.com/uploads/1/3/4/4/134441248/sujinedokuradaxikew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_5f9f2d34ca6e9.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/67e6862c-6ba3-4214-9f4e-0bfd122baa4f/bo_donaldson_and_the_heywoods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4e10c7-450b-4819-b2b5-2662d980b0ea/venitekefisimofogej.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_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 5284 bytes
SHA-256: 4d3a1f08aeea56527110b6c4b0be91b8f146b8e4d262ae06993391f4361f907d
font_01_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 10612 bytes
SHA-256: 39d509a2cfb0c6ed12af775f563db5c60a812eaa2cf146ad221f4d7401c18434

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