Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac31e1ae926e4eaa…

MALICIOUS

PDF

89.0 KB Created: 2021-03-29 01:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7d51770acdcb8496c7414d56eacf0f50 SHA-1: d70b55bdb105c74dd7bd0a17aae58ea3bdadb4f1 SHA-256: ac31e1ae926e4eaa29c0f22835f2ab449d543b05a5065fde20cc5d4b50c7d086
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs, many pointing to disposable hosting, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and external links indicate a likely attempt to exploit users by directing them to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://kuzutuzo.ru/award?keyword=html+to+pdf+python+2 PDF link annotation
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/maxoz-xerexusenulevuw.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/aURjcNK/craigslist_denver_jobs_dishwasher.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/gfMhim0/5355262882.pdfIn PDF document text
    • http://zijezokoriwe.iblogger.org/xereki.pdfIn PDF document text
    • http://jsexj.fun/erupao_acneiforme_causasburxs.pdfIn PDF document text
    • http://internet-babki.ru/dungeons_and_dragons_character_generator_5etlxvv.pdfIn PDF document text
    • https://gugukufetufa.weebly.com/uploads/1/3/4/3/134337187/towurefimupezex_bogur.pdfIn PDF document text
    • https://fumabufoduf.weebly.com/uploads/1/3/5/3/135313851/2715589.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/diamond_quest_don_t_rush_mod_apk_revdlk31mf.pdfIn PDF document text
    • https://ganepivojo.weebly.com/uploads/1/3/4/7/134774155/8520634.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/pCijUid/wonuben.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/girjegh/falling_down_lyrics_the8.pdfIn PDF document text
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/9242308.pdfIn PDF document text
    • http://naturfresh.space/19323609635tvsl0.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/heR9kE1/pocket_sniper_crazy_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosewobagoxubok.rf.gd/steps_in_performance_appraisal_interview.pdfIn PDF document text
    • http://povemuxituziv.epizy.com/margaritaville_drink_maker_replacement_parts.pdfIn PDF document text
    • http://gugivuma.rf.gd/22991163684.pdfIn PDF document text
    • http://xezemiguve.rf.gd/analytical_methods_validation_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484e643c-e6c6-4251-be2c-f0539e9e26a6/braun_series_9_cleaning_station_fluid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573f4330-2cb3-4da9-aa69-cde5ae652a9c/90154675521.pdfIn PDF document text
    • http://wugorasu.rf.gd/55024661513.pdfIn PDF document text
    • http://kavanovadegutok.rf.gd/pagifubonibodireg.pdfIn PDF document text
    • http://mijunuwe.epizy.com/does_the_military_have_maternity_leave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fdcee35-048b-43a5-9f0b-36882c978e55/27054515424.pdfIn PDF document text
    • http://walefusariwe.epizy.com/fonal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/345c4bc2-666c-41c3-827a-c2f983798bf5/sat_math_prep.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_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 4992 bytes
SHA-256: 027d1651f02015f93039eb991809803e19d647891bb9cdae45c545d24ba17fc4
font_01_sfnt_off00012e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E34 11904 bytes
SHA-256: 40facea3510158e8cdf4b6c84b3a0944c832959f4a32b4dc8bc5eb95498831ab