Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e30985af021869…

MALICIOUS

PDF

80.4 KB Created: 2021-02-15 04:33:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5606e65119f028771b9bff9ceba12d59 SHA-1: bd8573c1b2d1a216488d7814b6920844703bea8c SHA-256: e7e30985af021869fc62522e38d837bc9db418b84a78915232f75e2881276a4d
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one notable example being https://jottigo.ru/123?utm_term=head+of+committee, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable hosting. No scripts were extracted, but the presence of external links and the overall detection profile point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=head+of+committee PDF link annotation
    • https://xunuvetokogira.weebly.com/uploads/1/3/1/3/131384336/3442688.pdfIn PDF document text
    • https://novomuzedideb.weebly.com/uploads/1/3/1/4/131406537/masaxafim.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/neteduxo.pdfIn PDF document text
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/6156ec.pdfIn PDF document text
    • http://konovulibugu.iblogger.org/alternative_minimum_tax_form_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_600f923aa4a31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimitafukufes.rf.gd/picsart_mod_apk_terbaru_2019.pdfIn PDF document text
    • http://ditufadupogeju.epizy.com/7113530838.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/25928238732.pdfIn PDF document text
    • http://sovizurimi.rf.gd/6th_grade_language_arts_worksheets_printable_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/latutotikoboruluxim.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/89961419308.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/friends_quotes_images_free.pdfIn PDF document text
    • http://ripofosefalub.rf.gd/kitchenaid_burr_coffee_grinder_manual.pdfIn PDF document text
    • http://ripazek.epizy.com/berutobusazekuxadubenaki.pdfIn PDF document text
    • http://kigetivizaru.epizy.com/clinical_pharmacy_and_therapeutics_ebook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/club_election_ballot_template.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_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 4820 bytes
SHA-256: d0a040fbfaa2d200678ce951a27a38dcc25e9764189a0d94435a9df758bb2f3d
font_01_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 11716 bytes
SHA-256: 83ccf2363b8daf752b0878631d7eb5fcdc8d78eef48510f348f9a6e84a873046

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