Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a84aa00edc0fc19…

MALICIOUS

PDF

77.3 KB Created: 2021-05-19 09:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 099955623cfd894eb6f73d1a41ae0ecc SHA-1: a19c5baa91a5a1e4dc28454cd57d094132776358 SHA-256: 6a84aa00edc0fc1919cadb4ade7dba7a0c8625e45cb0479ff8fca6a8fc20e49d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/strik?utm_term=3d+crystal+puzzle+t+rex+instructions'. This indicates the document is designed to lure users to a potentially malicious website. The ML classifier also strongly flagged this PDF as malicious.

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://dafemum.ru/strik?utm_term=3d+crystal+puzzle+t+rex+instructions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412387/normal_605ff14314e4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_60488efd9e00e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_6015a204b3921.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452161/normal_60012052aa468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444369/normal_6032874a2d045.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388062/normal_600827098a86f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446272/normal_5fcbdcf43b10a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f800c3-c6f9-4004-9cc6-03a3b15eb7ef/geseninupumamomimukurek.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/short_story_reading_comprehension_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/dandelion_plant_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b174a19-575a-48a8-96a4-da44443c6c2e/rawememosurejidu.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/21122721137.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/dating_scan_accuracy_7_weeks.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/xasimewixotiwilinebiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/garnier_serum_sheet_mask_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/xururawitikovovupavutipim.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/1554759777.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/mr_coffee_burr_grinder_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/facilitator_guide_template_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/55980766233.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_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 5356 bytes
SHA-256: b0e9a861dc3598022ad94344e2d12c9f9926314ec2dc235de3d083626be39279
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 10868 bytes
SHA-256: 99d58bbd888d509d5a2b8b11c7b96515fc4fcd9e389baf4e2ce02bd23955c5ec

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