Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c41779a0f055bd…

MALICIOUS

PDF

77.3 KB Created: 2021-03-10 21:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d0ea6d5d7eaab346d8453d43e23ba118 SHA-1: 246b1ea41cf8a66e32d81513c4a0af0dc933efdc SHA-256: a3c41779a0f055bd51f301263667457c9f6a88282b08786422977ef786a49c58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/123?utm_term=acapella+music+video+in+3gp PDF link annotation
    • https://bamebifubakuta.weebly.com/uploads/1/3/1/4/131408159/4922296.pdfIn PDF document text
    • http://fb-ig-violation.com/15660056294jkovb.pdfIn PDF document text
    • https://cdn.sqhk.co/segexiji/ej1aBP8/baruputokogaxorokefirufev.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/air_force_one_shadow_pastel_pas_cherkyxpr.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/691e5.pdfIn PDF document text
    • http://livecopyrightverification.com/884307752342isjb.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/g3Eiihh/tumbletail_for_tumblr_pro_apk.pdfIn PDF document text
    • https://zoxusikajikad.weebly.com/uploads/1/3/4/8/134851315/5565399.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/TihfFie/bepimevafolanibiba.pdfIn PDF document text
    • http://erogan-encolumbia.site/thank_you_sympathy_card_template9vly4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bdb3e86-b3cd-4709-80f4-a040ee013cc8/schools_that_offer_interior_design_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a814e0-44be-45c6-afd8-645d65aaf1fb/runadifazal.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/pmp_certification_book_free_download.pdfIn PDF document text
    • http://gobonelore.epizy.com/navy_seal_training_program_bodybuilding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c49b399-dc16-4174-befb-63d3c5f616f6/48204404349.pdfIn PDF document text
    • http://gabozimipuz.epizy.com/is_the_anarchist_library_down.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/esl_countable_uncountable_food_worksheets.pdfIn PDF document text
    • http://tarunom.rf.gd/6317863462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea22d7a8-41ce-429d-b640-1c6bf092b10a/how_to_attach_hose_to_portable_air_conditioner.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_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 5512 bytes
SHA-256: cbcd7be56758ce97bb8f7cc4dca6430ef7e6b143cd8a905f63e673f22b362192
font_01_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 10984 bytes
SHA-256: aac8ae8befb36648ecb31487d5e605bf2c2cb96130da867b86f5883c917cd594