Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd58f5d318c29be…

MALICIOUS

PDF

70.4 KB Created: 2020-11-24 00:39:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4890040d91caa97cfd49dd1d375db008 SHA-1: 7365b1c6d52e021fb67ac1846e42c30a1db4f4cf SHA-256: fbd58f5d318c29beea00e0344af7a65cb475947d58ab2f076e0602ca2fee8b90
214 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, 'https://cctraff.ru/123?utm_term=2005+chrysler+300+manual+trunk+release', which is a strong indicator of malicious intent. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and a high ML classifier score further support this assessment. The document appears to be a phishing lure, attempting to trick users into visiting a malicious site.

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.
  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=2005+chrysler+300+manual+trunk+release
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f87398dab675.pdf
    • https://cdn-cms.f-static.net/uploads/4477649/normal_5fb41fec82737.pdf
    • https://cdn-cms.f-static.net/uploads/4426424/normal_5f9d6db7860bd.pdf
    • https://bujugerevik.weebly.com/uploads/1/3/4/6/134677448/2475496.pdf
    • https://cdn-cms.f-static.net/uploads/4465548/normal_5fbc35a6e9b6f.pdf
    • https://cdn-cms.f-static.net/uploads/4464852/normal_5fadd1d34d915.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lunojol/89455961636.pdf
    • https://s3.amazonaws.com/batoragubukepo/18528474250.pdf
    • https://uploads.strikinglycdn.com/files/adfdf229-acb3-41e4-b20e-78d36b501049/how_to_use_aircrack-_ng_kali.pdf
    • https://uploads.strikinglycdn.com/files/bba729e5-6a20-43d4-a89c-0edd80713faa/dungeon_masters_guide_5e_reddit.pdf
    • https://s3.amazonaws.com/bepukuba/redosifen.pdf
    • https://s3.amazonaws.com/rodigapigeta/minority_report_trailer_music.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_off0000c900.bin
cc90ed8883e8dc1dc1189cba273f019a484d060808a32ffea39cd70c4cb27db3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 5396 bytes
font_01_sfnt_off0000db24.bin
8dd7db43a759638498b7139aa480355372527276b9416bfd6e7c8fda9a4da04e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 10272 bytes
font_02_sfnt_off0000fe62.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 4324 bytes

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