Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfb7415d65d8e3d…

MALICIOUS

PDF

75.4 KB Created: 2021-02-05 10:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0019341ed0a8494df99fb56455d01ebe SHA-1: 48995c5af470b0935ae373ab1527b21e41eaf421 SHA-256: 0cfb7415d65d8e3d64cd5d31666260c45a1f1ce4110f00871c5eef00b62b51f2
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. The ML classifier also flagged it with high confidence. The embedded URL points to a suspicious domain, likely serving as a lure for phishing or to download a secondary payload. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=above%20the%20line%20promotion%20pdf In PDF document text
    • https://cdn.sqhk.co/romilononove/ivMiejd/44533780212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409393/normal_5fe1266f9075e.pdfIn PDF document text
    • https://cdn.sqhk.co/sufokorume/ihdhcZT/bigby_wolf_x_male_reader.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480148/normal_5ff9196bc3d59.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/icsKgdN/mortal_kombat_10_scorpion_moves_xbox_one.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_601b6e9a794f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_60109429b8dc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_5fdb0c3281f4d.pdfIn PDF document text
    • http://penaleduduzib.iblogger.org/windows_7_ultimate_64_bit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_5fdb0a79e8988.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/dupula/mezamewedevogek.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/moxoki.pdfIn PDF document text
    • http://bexamunexena.rf.gd/marriage_affidavit_format_in_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/sirubukuwonapulaloleguwid.pdfIn PDF document text
    • http://repogadobuwiri.epizy.com/let_it_go_sheet_music_frozen.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/62842521725.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_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 5080 bytes
SHA-256: 231da775efba6e32ac91d05bb69cfc6694844e5a852d51cfee44fb449d939915
font_01_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 10712 bytes
SHA-256: 43ceed5a2c39cdca7427b35fca6aaf17494543c612a328643f6d12e5b7743771

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