Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16cd1767677a765…

MALICIOUS

PDF

81.7 KB Created: 2021-03-20 21:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c3eed7dc6f4932f5921375ecd4176fa0 SHA-1: 57fc67124bfbd3e4556aa85a8a513039b9009d5d SHA-256: c16cd1767677a765b7c08d36c37cab39dc11b59459c10f19f120a38018ab715a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was flagged by multiple heuristics as a credential phishing lure impersonating Facebook. It contains numerous external URIs, including one pointing to a link farm on disposable hosting and another to a Weebly-hosted PDF, suggesting a phishing campaign. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://bimenejujuw.weebly.com/uploads/1/3/4/5/134592033/c92d94705f6e.pdf.
  • 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://vilenefex.ru/123?utm_term=abcd+malayalam+full+movie++in+tamilrockers PDF link annotation
    • https://cdn.sqhk.co/defegitip/ciijcjc/doxikarezasosop.pdfIn PDF document text
    • http://suxoxaxowigab.scienceontheweb.net/berserk_manga_chapter_150.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/is_the_canon_ts3322_printer_compatible_with_chromebook.pdfIn PDF document text
    • https://bimenejujuw.weebly.com/uploads/1/3/4/5/134592033/c92d94705f6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_602cb2cc03063.pdfIn PDF document text
    • https://rulewosiziruzo.weebly.com/uploads/1/3/0/7/130739522/vinapexeke_xetogi_fokabosar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_604e3a465c635.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/de_que_se_trata_la_obra_cien_aos_de_soledad_resumen.pdfIn PDF document text
    • https://felomavemupej.weebly.com/uploads/1/3/4/5/134583365/lajuxoxonow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_6021a60cdd721.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/gfghGje/lidotigepobizofar.pdfIn PDF document text
    • https://cdn.sqhk.co/surudije/lhbxjh0/bamejeroxadewote.pdfIn PDF document text
    • https://sowujapureku.weebly.com/uploads/1/3/0/9/130969862/goxiguzo-pujudilesugewo.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/dmKbhe1/ps4_games_steering_wheel_compatible.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/8c69180.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://wenares.myartsonline.com/les_miserables_stage_cast_2012.pdfIn PDF document text
    • http://xagulog.epizy.com/76440657833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b3f54a-c752-4358-8fa9-23fed9baf86b/60931358760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4770a90c-b246-4006-a551-2f2faf0b115a/how_to_detect_carbon_monoxide_without_detector.pdfIn PDF document text
    • http://fadowudi.rf.gd/remo_audio_songs_free_in_tamil.pdfIn PDF document text
    • http://xadiromawa.epizy.com/powerpoint_org_chart_template_2010.pdfIn PDF document text
    • http://jopasimu.rf.gd/buried_movie_in_isaidub.pdfIn PDF document text
    • http://vuloroluget.rf.gd/morfologi_bayam_hijau.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 5404 bytes
SHA-256: 677263866e450ad7512670495461a1227d16fc5dccb315df9445cc12eb0fcf81
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 10364 bytes
SHA-256: 5641da01ec40d65861262da26a3517f4d07b801d6e52d65a630e26bd9ef033da
font_02_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3