Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4014f5846f05dce…

MALICIOUS

PDF

74.5 KB Created: 2021-01-24 12:13:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dca47082ae5e242fc6216ba08f7b492f SHA-1: be1efb92b4bebcc21c72e0685dcb25c527d07e85 SHA-256: a4014f5846f05dce629d15f4140d8e94fb7b5f2bab0be5e3936dd032e9179d7d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links to other PDF documents hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

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://bologen.ru/aws?utm_term=cambridge+dictionary+philosophy+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4529977/normal_5fde672156b93.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/nadafokig_gufipejekiz_pazedanug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423700/normal_5fc947d629fc3.pdfIn PDF document text
    • https://fuluposusiziz.weebly.com/uploads/1/3/5/3/135321682/lowex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_600b2745eba6d.pdfIn PDF document text
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/rutavusuzanixa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505687/normal_5fef103ff1856.pdfIn PDF document text
    • https://tapogizixe.weebly.com/uploads/1/3/4/8/134897788/savib_gitejaxikina.pdfIn PDF document text
    • http://optalpha.com/7171629095irh2y.pdfIn PDF document text
    • http://procripton.com/8863700599vrrmw.pdfIn PDF document text
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/wasuderut.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/Ehewjee/asterix_and_friends_mod_apk_2._0._3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sabukizazuse.epizy.com/85157759770.pdfIn PDF document text
    • http://vimiromomekex.epizy.com/limoboxafagakekesubeki.pdfIn PDF document text
    • http://dunuruzofugavix.rf.gd/xubova.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_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 5716 bytes
SHA-256: 72491fbe3e20f4dbbec286edba9468623ed1b095e921e0401efdcc8aaab55f32
font_01_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 11508 bytes
SHA-256: ceb51a6c5c1ea5498a50464fe5870086685adbcfc40067a7b91788d90aaff3c7

Open this report in the interactive analyzer, or submit your own file for analysis.