Malicious PDF — malware analysis report

Static analysis result for SHA-256 74328e1ec6d3679d…

MALICIOUS

PDF

78.1 KB Created: 2020-11-26 02:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1290a487ed1ebeaee76b180c29312e61 SHA-1: 154ba5271921b6ce3c537d9120509f5711482e43 SHA-256: 74328e1ec6d3679d88d13a3ba810f6925a1c2f9451369e9bcdff3adcfa122848
214 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://cctraff.ru/strik?utm_term=the+story+of+caedmon'. It also exhibits a PDF link farm behavior with 30 external links, many pointing to 'cdn-cms.f-static.net'. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. The embedded document body text is heavily obfuscated and unreadable, but the presence of numerous links suggests an attempt to lure users to malicious or manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=the+story+of+caedmon
    • https://cdn-cms.f-static.net/uploads/4458431/normal_5fbb67855e51a.pdf
    • https://cdn-cms.f-static.net/uploads/4492257/normal_5fb9bc4d89495.pdf
    • https://cdn-cms.f-static.net/uploads/4417526/normal_5fab3da761cd2.pdf
    • https://cdn-cms.f-static.net/uploads/4495251/normal_5fadac1573529.pdf
    • https://gupugeja.weebly.com/uploads/1/3/4/2/134235999/2ed4e2b24425d.pdf
    • https://kejuzeke.weebly.com/uploads/1/3/4/4/134456394/kizasuvekopokafo.pdf
    • https://cdn-cms.f-static.net/uploads/4374848/normal_5f8cc31d01c2a.pdf
    • https://kigekasomek.weebly.com/uploads/1/3/4/5/134598498/4489409.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zoromexemuzid/vurokogovoramowupasele.pdf
    • https://s3.amazonaws.com/tixedujegibex/amadeus_commands_manual.pdf
    • https://uploads.strikinglycdn.com/files/fe4db2f0-5afd-4458-899b-3cae57f083d9/pefetoto.pdf
    • https://uploads.strikinglycdn.com/files/a2a1f386-ba1a-4e82-a41f-cb02b9939bc6/diravuroxinipotebofabunoz.pdf
    • https://uploads.strikinglycdn.com/files/2d8e432f-f7ac-46c1-bd26-9532a075e604/zyxem_para_que_serve.pdf
    • https://s3.amazonaws.com/rebomedug/44301050544.pdf
    • https://uploads.strikinglycdn.com/files/45b2a60e-f88f-4e2f-926f-a21b1658337c/tajowetasimufilavilo.pdf
    • https://uploads.strikinglycdn.com/files/c1da0914-8695-45b2-8166-f7cd039f9a6d/interpersonal_process_in_therapy.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90d.bin
a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 2900 bytes
font_01_sfnt_off0000e34f.bin
22b6499a911cf35f14d54aff5e012fac9c3d5c3c169f31f9d97384a9d38c2a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 5020 bytes
font_02_sfnt_off0000f43c.bin
b1a51aa3c59a2917a25d07de63bc5121259db3cbe48080fb5102d2b85b37a3f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 13432 bytes
font_03_sfnt_off00011cfa.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 4324 bytes

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