Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd23fd7f54204dd…

MALICIOUS

PDF

78.8 KB Created: 2021-02-24 01:24:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2e2fc79d302255c959276cfa82e16465 SHA-1: 54578c8feae29823f9af85b312916812bce724de SHA-256: dfd23fd7f54204ddc620fd2644c1531510f5b3e0ff7a4bb320ddb3ac9fb5d630
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 or link farms, indicating a likely phishing or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://seumenha.ru/strik?utm_term=what+is+the+best+27+inch+double+wall+oven PDF link annotation
    • https://cdn.sqhk.co/ribobujir/jaSrRUH/7108114925.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/cambridge_audio_s70ffixw.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/Ojjvig9/95697986595.pdfIn PDF document text
    • https://cdn.sqhk.co/bumadawab/ngg9ja8/dagawupibak.pdfIn PDF document text
    • http://bionatur.space/232762217546txc5.pdfIn PDF document text
    • https://cdn.sqhk.co/tobipamu/dfhcjgZ/47419762086.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/jihhdhb/rizugumukurulitekotuligis.pdfIn PDF document text
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/lotoxojopenu.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
    • http://kiwusumusi.rf.gd/28137897849.pdfIn PDF document text
    • http://nepowatalol.epizy.com/korinewomiwegufarix.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/cardinal_number_1-_100_worksheet.pdfIn PDF document text
    • http://fawivemepogu.epizy.com/anorectal_malformation_in_child.pdfIn PDF document text
    • http://sijaxulo.rf.gd/91951684186.pdfIn PDF document text
    • http://godamelo.epizy.com/voxapanofik.pdfIn PDF document text
    • http://zilokujidetomo.epizy.com/bhagam_bhag_movie_1080p.pdfIn PDF document text
    • http://faxiwig.epizy.com/correct_pronunciation_of_words.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_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 5332 bytes
SHA-256: ce98b7b99cce0728ff647d2e2627faae5a5ad3c29b8fb48291792a17ee7defea
font_01_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 11236 bytes
SHA-256: 3f9d7c03134b546977c119d93228fb687af5de52180058b002eb63cb95e0a300
font_02_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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