Malicious PDF — malware analysis report

Static analysis result for SHA-256 430bb69e6c1ca049…

MALICIOUS

PDF

72.9 KB Created: 2021-03-02 13:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eb17c6096d2ea511f3ed1dea32720d1 SHA-1: ba303ddf171211318cfcdfdad4bc4289723ff069 SHA-256: 430bb69e6c1ca0495babe3c517592a39baf950afe02816d6818835795b259a14
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating a link farm or phishing attempt. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. The document body, though heavily obfuscated, contains keywords related to a novel, likely a lure to disguise the malicious intent of directing users to a network of external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/strik?utm_term=murder+on+the+orient+express+novel+age+rating
    • http://dosijefa.mypressonline.com/bopubemigalozepubub.pdf
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/60f6ced.pdf
    • http://bagawixaj.mywebcommunity.org/ranger_american_alarm_yellow_system_light.pdf
    • https://barefofu.weebly.com/uploads/1/3/4/4/134492989/5359603.pdf
    • https://static.s123-cdn-static.com/uploads/4404984/normal_6006b4432887e.pdf
    • https://cdn-cms.f-static.net/uploads/4389127/normal_6015850d1e907.pdf
    • https://ponebivilu.weebly.com/uploads/1/3/4/5/134505494/sexukaba.pdf
    • https://cdn-cms.f-static.net/uploads/4384470/normal_601432da6d6cd.pdf
    • https://cdn-cms.f-static.net/uploads/4393019/normal_602cedf540980.pdf
    • https://cdn-cms.f-static.net/uploads/4446651/normal_601604f925f89.pdf
    • https://static.s123-cdn-static.com/uploads/4490263/normal_6004c16d6399a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nixomirorubu.myartsonline.com/88732425174.pdf
    • https://s3.amazonaws.com/jusuberu/create_own_spreadsheet_app.pdf
    • https://s3.amazonaws.com/fekife/ddj-sx2_software__firmware_updates.pdf
    • https://s3.amazonaws.com/jebokizez/26618613505.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb4.bin
c907e61738313f8a19aa32ccffc1b902077431e140da528a8d59e87fe7ece712
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 5356 bytes
font_01_sfnt_off0000f1fa.bin
5512ea7bd3edc824382109380db634558ced53b9c75e6f17aa2cfa723ae709a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 10648 bytes