Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9aba3c0f52edce…

MALICIOUS

PDF

97.9 KB Created: 2021-04-05 12:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 92aed87e706aef376b9fc88ea55da4bc SHA-1: 166bc7d647423096f10c753d406b62deeaaf679f SHA-256: 3a9aba3c0f52edced7f6abcd23736bcfe6cc723707bed0854f5f7e0bff8de0b9
186 Risk Score

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/wix?keyword=vmware+vca+study+guide PDF link annotation
    • http://fosonelotila.medianewsonline.com/skg_bread_maker_recipe_book.pdfIn PDF document text
    • https://nometoxuf.weebly.com/uploads/1/3/4/2/134266561/a83ff2b787a.pdfIn PDF document text
    • https://mejavepo.weebly.com/uploads/1/3/1/4/131438157/japipatiduzep_vudugofadibe_fufazamavizotim.pdfIn PDF document text
    • https://fowifosefudewak.weebly.com/uploads/1/3/4/6/134699900/gigozafuw.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/ayatul_kursi_arabic_download.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/the_accidental_prime_minister_book_in_telugu.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/a9c43.pdfIn PDF document text
    • http://zowogusatutojus.mywebcommunity.org/defunuzofim.pdfIn PDF document text
    • https://figowemepiwe.weebly.com/uploads/1/3/1/3/131398533/gimulovajum-zapakix-jaxawomev-runabajo.pdfIn PDF document text
    • http://gevenukodujojov.getenjoyment.net/data_communication_and_networking_for_ibps_it_officer.pdfIn PDF document text
    • https://budasanufewe.weebly.com/uploads/1/3/5/3/135323580/xerugedoje_vonifoju_robonurejoven_josowova.pdfIn PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/1463060.pdfIn PDF document text
    • https://pofemazavuson.weebly.com/uploads/1/3/2/3/132303373/ziris-liwagakej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_ef73d18176974e78b1314e0e57fee602.pdf?index=trueIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_4cf1289b77e04a08b3cc3d32f74db9f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/dixujurodofobisujiko.pdfIn PDF document text
    • http://tiruweditivunaw.myartsonline.com/motorola_mc9090_stuck_on_boot_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/europe_before_world_war_1_map_worksheet_answers.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_off000142d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D2 5448 bytes
SHA-256: d4eec1b6fcb4241129e6363d4d8c5c5e7a3f5c88904864bd1ca450a5aaba9894
font_01_sfnt_off0001555f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555F 11048 bytes
SHA-256: bdd40551db7abb44a1c68f41f3baca7cf6f566b897e0a59b31b78a63cafef291

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