Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf85bc3c4265aa48…

MALICIOUS

PDF

77.1 KB Created: 2021-01-15 00:33:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 340476a6d8a038ef6f50199c04fafbe6 SHA-1: db859fe766699b9e8df297ccc2f5f1d06e5d7ba3 SHA-256: cf85bc3c4265aa48849123ad67241f17860f38a0ea99be10b16fbcc37c2bd3fc
174 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, and heuristic analysis indicates it is a callback phishing lure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links and the callback lure pattern suggest an attempt to trick the user into interacting with malicious infrastructure, likely for financial fraud or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffmen.ru/aws?utm_term=mandatory+reporting+oregon+video
    • https://cdn.sqhk.co/ruxuvedije/Y2Kf4nc/baby_memorial_hospital_booking_phone_number.pdf
    • https://cdn-cms.f-static.net/uploads/4464082/normal_5fbf99dd13835.pdf
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5fc87b96ac745.pdf
    • https://cdn-cms.f-static.net/uploads/4384050/normal_5f993cdba5fea.pdf
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f8a1a862b74b.pdf
    • https://cdn-cms.f-static.net/uploads/4490123/normal_5fe90e9fedebf.pdf
    • https://cdn.sqhk.co/doxowite/jaZiaxe/luwanemofe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bidemewufa/plotting_cumulative_frequency_graphs_worksheet.pdf
    • https://s3.amazonaws.com/sefiwegegagu/chole_ki_sabji_video.pdf
    • https://s3.amazonaws.com/wotodedaruzuk/24822728331.pdf
    • https://s3.amazonaws.com/jedaxopopuko/gujevazup.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e435.bin
70bd24dd1921d11de1cf228fbc52508c1f427313bf4831664d13070e29393477
pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 4872 bytes
font_01_sfnt_off0000f4e2.bin
ffbd2438ecd4b10b0c7a8dc58506311ae827f1a0ed60c32e8ecee105fc26524c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 10788 bytes
font_02_sfnt_off00011997.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 4324 bytes