Malicious PDF — malware analysis report

Static analysis result for SHA-256 7526421e5109b4f5…

MALICIOUS

PDF

76.1 KB Created: 2021-05-19 10:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 618b6ac57c9b61054b52173570c6855e SHA-1: 26ace7e5f89df1be17082ecafcc2189cb8d5961a SHA-256: 7526421e5109b4f59efac5067d0a0e6eded041efd5741eacd13c4917fdc4a211
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The embedded URL 'https://maypoin.ru/strik?utm_term=is+it+safe+to+take+imodium+two+days+in+a+row' is likely part of this scheme, aiming to direct users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=is+it+safe+to+take+imodium+two+days+in+a+row PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497344/normal_606940c9e03bc.pdfIn PDF document text
    • http://durikudu.iblogger.org/reliability_centered_maintenance_training.pdfIn PDF document text
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/50e58bc5a09135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415300/normal_60021660cb374.pdfIn PDF document text
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/4328975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_603c6eb17ccf9.pdfIn PDF document text
    • http://pemutoguxo.66ghz.com/balsamo_bengue_bula.pdfIn PDF document text
    • http://vukabakoxipus.22web.org/perfect_english_grammar_present_perfect_simple_or_present_perfect_continuous_exercise_2.pdfIn PDF document text
    • https://redirusoko.weebly.com/uploads/1/3/4/7/134704710/e7702c0d695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443325/normal_60310835d9670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_606778c8c13ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_601587c5ea457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_601ccd211bd9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466367/normal_600a9f287b264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_60249b2d6697f.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/9b9b322f-e71a-416a-9821-d85321bece12/35475273618.pdfIn PDF document text
    • http://novosumagib.epizy.com/nejuvumuvajomemediren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b07268-3b7d-4316-a703-bd326eefdf21/parallel_myths_by_j.f._bierlein.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e255f240-6550-4701-b217-5713b50d633b/tea_bag_poem_peter_dixon.pdfIn PDF document text
    • http://tebubire.epizy.com/alternative_dispute_resolution_law_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da190fb-1285-42ad-b2b1-c6ccd5410287/paper_menagerie_symbolism.pdfIn PDF document text
    • http://jarujoburisuw.rf.gd/chori_chupke_movie_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f182083-8efd-4e56-99c3-7b94400b3803/preparation_of_m-dinitrobenzene_from_nitrobenzene.pdfIn PDF document text
    • http://faxanudof.epizy.com/dupurexarabirudepuzalet.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_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 5216 bytes
SHA-256: 4b5b142535d533c19e3cb237823035815f577e9ef3dbd8a5acb81cb4afcab99e
font_01_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 10344 bytes
SHA-256: 7b4c64987351e5b5e0b231217fce12307120a975e801a31b641b87b9b2e0fbca