Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa296293cbfd0d86…

MALICIOUS

PDF

71.6 KB Created: 2021-02-15 18:26:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e86d004c62eb8f47437a4a314da2be10 SHA-1: e8ce0630f02919ab4c7aafc182d6fbb7197fdb53 SHA-256: fa296293cbfd0d8629fa966cff1eae9065bc87d1687b443e14c244bd76e757b3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://yafferge.ru/strik'. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=forgotten+realms+gods+symbols In PDF document text
    • https://cdn.sqhk.co/modonasuje/aJQ7Uhc/95760514076.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451208/normal_5fe0cb746e8be.pdfIn PDF document text
    • http://tiwelonepozafuw.iblogger.org/tamil_dubbed_thriller_movies_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385876/normal_5fd10eb4c9400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485014/normal_6007b746e7706.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481055/normal_600840afbbb63.pdfIn PDF document text
    • https://cdn.sqhk.co/monubinejon/igifjbO/duet_bakery_order_online.pdfIn PDF document text
    • http://cetapp.xyz/tanobefuxajaresozujeredof2k7yb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404959/normal_60296d98e711e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liguwubore/43533966656.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/backup_android_contacts_without_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/22940441576.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/3853643863.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/ccna_security_espaol_2017.pdfIn PDF document text
    • http://jovunalinuz.rf.gd/98995315950.pdfIn PDF document text
    • http://dulibifusarumo.rf.gd/blackshot_game_android_apk.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_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 5340 bytes
SHA-256: 94d8580e9a60334377752c3eb8a800b251c856374412f61e759e8af40feac7b5
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 11348 bytes
SHA-256: a3b9661c4362d3b9711b402d09dbd06df50077bc2f6402d5501618b8fe333b24

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