Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a61fd2f41c5876…

MALICIOUS

PDF

80.1 KB Created: 2021-02-14 03:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f0431a27fa90ff132213e8af9c1a1cfa SHA-1: da0b7900afa56b79f9a083b31f85339e8141c83a SHA-256: c6a61fd2f41c58765b4b0c10b456f010b2536043193666de452efdeff89e5bb6
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, yafferge.ru, which is disguised as a Baskin Robbins application. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL and the heuristic for a redirector link suggest the primary goal is to lead the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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
  • 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/wix?keyword=baskin+robbins+application+online In PDF document text
    • http://souve.me/59263725528928wn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490370/normal_60135bdb3fb12.pdfIn PDF document text
    • http://dfds.in/69256366455vn4yv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418783/normal_5fe1cd95e7990.pdfIn PDF document text
    • http://youtube-subscribes.com/vidimiro3c7j1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488316/normal_5ffcbf84e0983.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407810/normal_5fe25c3a614f3.pdfIn PDF document text
    • http://max-lifting.store/91764631296pcl8b.pdfIn PDF document text
    • http://buylettersonline.com/33925756737nw18q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_5fd6665c744d5.pdfIn PDF document text
    • http://setofexperience.site/kamyab_jawan_program_form_bop6y9ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473616/normal_602368337593f.pdfIn PDF document text
    • http://hookup673.site/92226589876z4ks6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xuzed/bajrang_dal_song_djking.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/baligitavomevezojuzexodon.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/breaking_benjamin_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/45825055996.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/chunghop_universal_tv_remote_rm-_88e_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 4968 bytes
SHA-256: 2497eadcd5e8154f306aa4a48d1adb34db833173909543d2c1baf93896cd8c82
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 11028 bytes
SHA-256: 17227786023d90a36fb9f4e6792d727a4df2b15ade5d9acb201e28caedf047b8
font_02_sfnt_off00012552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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