Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1c3292ab170cec…

MALICIOUS

PDF

64.0 KB Created: 2021-02-19 07:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 40cff9eaf8293706f4628cc6e3d3a327 SHA-1: 72108d1c373fea31f031b6c94d7dc76f4499c61a SHA-256: fe1c3292ab170ceca8e11739e49fbdbda828b6a3dd582391a237463f9441c9b0
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://baarspo.ru/strik?utm_term=bose+wave+radio+4+bluetooth+adapter', appears to be a lure for a specific product search. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful sites.

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://baarspo.ru/strik?utm_term=bose+wave+radio+4+bluetooth+adapter PDF link annotation
    • https://fofifiso.weebly.com/uploads/1/3/4/6/134613093/letupamu_fizufotil.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/e329b1e.pdfIn PDF document text
    • https://dafizigupiteg.weebly.com/uploads/1/3/4/4/134492389/firewagodizexag.pdfIn PDF document text
    • https://zaxusivu.weebly.com/uploads/1/3/5/3/135393217/siwodivaxexorojolix.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/LjghbBh/41506569230.pdfIn PDF document text
    • https://dezuvatag.weebly.com/uploads/1/3/4/6/134667454/fipemar.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/ggjGQgS/airplane_mode_movie_2019.pdfIn PDF document text
    • http://help-copyrighteamservice.com/44733017689dnklf.pdfIn PDF document text
    • http://comp-arenda.site/factoring_polynomials_practice_worksheet_with_answers91xu5.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/telaw.pdfIn PDF document text
    • http://secureappeal.com/54018890890msqjw.pdfIn PDF document text
    • http://in-arenas.com/what_kills_spotted_lanternfly_eggslw47b.pdfIn PDF document text
    • http://gakmancreatures.ru/pdf_ausfllen_linux3yqyj.pdfIn PDF document text
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/tibijunagorina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujubigakokuv.epizy.com/vanokobatejuwoxeg.pdfIn PDF document text
    • http://namutogenasokab.epizy.com/99926319605.pdfIn PDF document text
    • http://budakokubogomax.rf.gd/campbell_hausfeld_impact_wrench_tl1402_manual.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_off0000bd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0C 5476 bytes
SHA-256: 63a7449c035af6594fd2d931c894644853b24badca9f1e209c37eb9f82d1a8fb
font_01_sfnt_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 10344 bytes
SHA-256: 04c47db1549d0d7b0214849de03f2a1a5824148acb976863e9b6692971e6833c

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