Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e31e35bba949080…

MALICIOUS

PDF

68.1 KB Created: 2021-01-03 03:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: faf32c03e6002788be1241a1517370ce SHA-1: edf343dc39b995cb6909ca6e95eb3b2b9b801a07 SHA-256: 4e31e35bba94908091e8005251128399c7a08515488b6532eb0d55057f864bb3
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 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 pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the structure of the PDF indicate an attempt to redirect users to potentially malicious content or phishing sites.

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://traffine.ru/123?utm_term=gx+6750+electronic+typewriter+manual PDF link annotation
    • https://lubumona.weebly.com/uploads/1/3/4/6/134648672/95519f67aec2.pdfIn PDF document text
    • https://defoxili.weebly.com/uploads/1/3/4/5/134527702/medekorotumomare.pdfIn PDF document text
    • https://lorovojiwu.weebly.com/uploads/1/3/4/3/134318747/83e257fa4e17.pdfIn PDF document text
    • https://nepagezefo.weebly.com/uploads/1/3/4/4/134472827/026847efbb6357.pdfIn PDF document text
    • https://nutajutibasetak.weebly.com/uploads/1/3/4/6/134638930/wivosinusuvugo_gizusodetaxosij_sedatukaruj_xuxetisu.pdfIn PDF document text
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/8ed7f8090.pdfIn PDF document text
    • https://doketilid.weebly.com/uploads/1/3/4/5/134529618/nibazibibakuz-bavesa.pdfIn PDF document text
    • https://cdn.sqhk.co/lipetebo/ggigehc/horizon_chase_world_tour_apk_1._6._20.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/649deda7-7c3a-4aa2-ac71-d9675f0b5ee8/246115458.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/52_kg_in_lbs_and_oz.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/bedofigafujiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23cea3b2-f2ef-4984-8224-052b6215f47d/yamaha_v_star_1100_oil_filter_part_number.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_off0000c839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC839 5692 bytes
SHA-256: 1d5f522ff06955d9832ba911d52c19a279454bef6ae59d5c704b9ab07540f823
font_01_sfnt_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 11332 bytes
SHA-256: f6ee30b400d2bbeecc7cda85101213b191fa842cac0ea22de2cad8943e151cf1

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