Malicious PDF — malware analysis report

Static analysis result for SHA-256 6295645e4bc1960a…

MALICIOUS

PDF

78.9 KB Created: 2021-01-18 06:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5de24307fedbd5a2582a6994358d6665 SHA-1: 04ef74b8f1fb82fbd7c5330f585a816f3ad430b9 SHA-256: 6295645e4bc1960ac8ad3f86dcdd0b041cfcd4ee4e295cb55d1160166d29d172
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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://trafftec.ru/123?utm_term=plate+boundary+worksheet+high+school PDF link annotation
    • https://gizarokidobibaw.weebly.com/uploads/1/3/4/3/134363860/0ac479.pdfIn PDF document text
    • http://zazonowipudu.66ghz.com/xomagirigonubuterepoj.pdfIn PDF document text
    • https://lapaluletegole.weebly.com/uploads/1/3/4/6/134679291/piwibulat-wujik.pdfIn PDF document text
    • https://site-1180648.mozfiles.com/files/1180648/evenflo_breast_pump_manual_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413469/normal_5f96d3be04a67.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/rigalado-tekaxobo-mowalelutisenu.pdfIn PDF document text
    • https://site-1204117.mozfiles.com/files/1204117/vokofizudoziwiwoga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_5fad9edc61a6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5fc22cf932b4b.pdfIn PDF document text
    • https://site-1180426.mozfiles.com/files/1180426/63755279320.pdfIn PDF document text
    • https://site-1175287.mozfiles.com/files/1175287/phoenix_wright_games_timeline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504788/normal_5fbadcfa0f626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417988/normal_5fe04d6a154e1.pdfIn PDF document text
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/2806613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_5fa80e041992d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_5fad7f2429104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5fa73fd11d43b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405195/normal_6004f430dee6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zakuvusebaj.epizy.com/jiruxizute.pdfIn PDF document text
    • http://vavijirodujozi.rf.gd/25916742943.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_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 5600 bytes
SHA-256: c492f1fe53763b3fa1d6c7563bf759be99b18b573f17cdca1c1ade55a0e6963a
font_01_sfnt_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 10800 bytes
SHA-256: 7a5437dde763274e971312f8b977464ed5c74c1d649043597ccba746f1741c32

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