Malicious PDF — malware analysis report

Static analysis result for SHA-256 9056aa6cb88c4655…

MALICIOUS

PDF

87.2 KB Created: 2021-02-20 05:23:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9ec031385d77fdc598cadd0c14c5be51 SHA-1: 6f76350fa5c73a3ae69e1b263f2e6cf71040aa35 SHA-256: 9056aa6cb88c465555121f610c46630d30781b9570586881378c0631cf5cb886
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous external URIs on disposable domains, likely to obfuscate malicious destinations. The document body is heavily obfuscated and contains no readable content, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://druttle.ru/aws?utm_term=behringer+u-phoria+um2+guitar PDF link annotation
    • https://cdn.sqhk.co/rexukewanej/hhAlial/strategic_management_journal_replication.pdfIn PDF document text
    • https://cdn.sqhk.co/wewotiwalote/ik0jihf/laxugutevobij.pdfIn PDF document text
    • http://manekobe.22web.org/62960012045.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/gzjjaLD/live_chat_rooms_for_anxiety.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/ggHiigd/fubenimesumeli.pdfIn PDF document text
    • http://temezisabekazev.iblogger.org/cesare_pavese_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/timafewa/6gg5Phg/48892694717.pdfIn PDF document text
    • http://winoraama.website/black_and_decker_edger_bladesa61k1.pdfIn PDF document text
    • http://levinorutuw.iblogger.org/free_rent_agreement_format_in_marathi.pdfIn PDF document text
    • http://autolombardpro.ru/31654638098mk7y0.pdfIn PDF document text
    • http://chambrehq.xyz/plantar_fasciitis_exercises_espanoliapf5.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/dPw0v1P/vudabopibabesugor.pdfIn PDF document text
    • http://delojenopow.66ghz.com/juvazuzotovefasaroguga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenimawibi.epizy.com/how_to_turn_down_pilot_light_fireplace.pdfIn PDF document text
    • http://lidilivutusiji.epizy.com/25670458392.pdfIn PDF document text
    • http://vapasiwivomod.epizy.com/tunemilarexazaw.pdfIn PDF document text
    • http://jeragapa.epizy.com/aagadu_movie_comedy_scenes_free.pdfIn PDF document text
    • http://padepivezaw.rf.gd/jakixirupinolepumujepen.pdfIn PDF document text
    • http://kodireso.epizy.com/kovifexugirabenimafeb.pdfIn PDF document text
    • http://lejugilisotev.rf.gd/tenox.pdfIn PDF document text
    • http://pamakejexo.epizy.com/66187160514.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_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 5236 bytes
SHA-256: 65f89ece21fe1072b7b62d5985853f69bf795d67e85a6fd68d3de76cbdc92c09
font_01_sfnt_off0001277d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277D 11220 bytes
SHA-256: 6770bf5297702b9bcc534c3cd12cdcde42ec5023931fcd8f6ac0fe23d9bb7ecf

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