Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfbf424bf1d439a…

MALICIOUS

PDF

72.3 KB Created: 2020-12-20 06:46:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ca156905a9f6a92485fcd5ebd46819e8 SHA-1: 2e31f1776bc4c219efdd4dd117890a364f055f22 SHA-256: 4bfbf424bf1d439af26b79b3e5e87b007a71b9077500f3e56803806e7257d4a0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan distribution vehicle. The document functions as a link farm, containing numerous external URLs pointing to other PDF files hosted on various domains, some of which are disposable. The primary URL, 'https://trafficel.ru/strik?utm_term=drugs+as+weapons+against+us+the+cia%2527s+murderous+targeting+of+sds+panthers+pdf', suggests a lure related to sensitive topics, potentially to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=drugs+as+weapons+against+us+the+cia%2527s+murderous+targeting+of+sds+panthers+pdf PDF link annotation
    • https://pemovoxi.weebly.com/uploads/1/3/4/6/134680353/6439921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_5fd2484921e83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445890/normal_5fd8e69139c26.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/37104c4f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446781/normal_5fb42fdf4fd1e.pdfIn PDF document text
    • https://kujofajatoniw.weebly.com/uploads/1/3/1/4/131406813/9891a09fca0f.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/bobitukefib.pdfIn PDF document text
    • https://wilowepixamu.weebly.com/uploads/1/3/4/4/134476622/bumidumogurog-ratawazojiru-zazuzulunifo-puxifa.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/c16f2e96.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://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf14c2edfcd2bda90684e/1606218060641/half_moon_bay_high_school_bell_schedule.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc52cd1c30a162e0c6e62de/t/5fd6bb32034a586a4f51b691/1607908147059/best_type_of_bed_sheet_material.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD75 5544 bytes
SHA-256: 5406598864ae9da1379f95ce4609dd218cb74cd6e9d001ebdb1a69ddd0776d8a
font_01_sfnt_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 10988 bytes
SHA-256: dd6b53ccea9eb5d7a0be9113abfa6cf820a5061d9ddf809e225a09c8ff2f3470
font_02_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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