Malicious PDF — malware analysis report

Static analysis result for SHA-256 557c97bc0f0b2315…

MALICIOUS

PDF

87.2 KB Created: 2021-04-03 22:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 50b7b06766e930c0828bffb5a34c7f82 SHA-1: b1ee6028b265852133b3b6370a1996348c9e0706 SHA-256: 557c97bc0f0b2315ab94242612a9343d4af0366bcb1eeca19498672ca3bb8afe
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 0.9991

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
  • 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://vilenefex.ru/strik?utm_term=ley+de+titulos+y+operaciones+de+credito+cheque PDF link annotation
    • https://cdn.sqhk.co/lejesapazud/6SIS8X1/legit_us_dating_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/rolaravez/iNpQOc2/64394590786.pdfIn PDF document text
    • https://cdn.sqhk.co/medasozuf/8hhsiiM/wizijokelamavonigegimen.pdfIn PDF document text
    • http://gelixovuxa.22web.org/puzobinuxadovetanew.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/8I4p2I4/freecycle_trash_nothing.pdfIn PDF document text
    • http://jujakivupas.iblogger.org/critical_temperature_definition.pdfIn PDF document text
    • http://xuforaxi.22web.org/81316028008.pdfIn PDF document text
    • https://cdn.sqhk.co/womelage/Vhd1BLi/2334387010.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_69b11e049d144f428c97fd5978bc24e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/pekowunisuliroro.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_89694bba642744a1ac30400f9d050480.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_170ccd98c0744b288429a9b1233fe3a0.pdf?index=trueIn PDF document text
    • http://kejuzodavexido.epizy.com/76998013695.pdfIn PDF document text
    • http://rawuzogese.rf.gd/tokewub.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_f846f806bc9f445cafae784522533e4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropuba/how_to_hard_reset_locked_iphone_without_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/6843388830.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/matrimonio_sobre_la_roca_dave_willis_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/81029060244.pdfIn PDF document text
    • http://remigesej.epizy.com/personal_administrativo_definicion.pdfIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_db8c10bcdc8b47e4940d751593f1aad6.pdf?index=trueIn PDF document text
    • http://gunuwoluzo.rf.gd/bikigiduk.pdfIn PDF document text
    • http://tumezubix.epizy.com/jquery_ajax_post_response.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/kikekodowudusosiguta.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_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 5332 bytes
SHA-256: e3ab5f21d36bf51e9ef54bfd7bf23a119bd3929f0307a6a20f6a391cc2b53bee
font_01_sfnt_off0001270c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270C 11796 bytes
SHA-256: 17a004e0129bfcc6cf50e0c0a184e5ced257cc0b1db0db0e5e31717443c732d2

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