Malicious PDF — malware analysis report

Static analysis result for SHA-256 f169217ddb882f3e…

MALICIOUS

PDF

75.9 KB Created: 2020-11-24 21:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47c7e627e62ea06260b1753a39a04c31 SHA-1: 1c143a0fe3da95fcefdfd6ad639953ebe2262891 SHA-256: f169217ddb882f3e46a537f50682b83a29c95853dfeb9045b4791d80c8cd7a9e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The primary external URL, https://trafffi.ru/strik?utm_term=potara+medals+guide, suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=potara+medals+guide
    • https://rereviraret.weebly.com/uploads/1/3/4/5/134512362/7dea425aa9a7e.pdf
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/4553236.pdf
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/winedil.pdf
    • https://sowameneritela.weebly.com/uploads/1/3/0/7/130775755/db83d2a0027b.pdf
    • https://wapapoda.weebly.com/uploads/1/3/4/5/134581042/9393526.pdf
    • https://lekinowi.weebly.com/uploads/1/3/4/4/134476644/velazusuzebojij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cf5b8cff-6a47-4a90-88c7-d28775f2d3e4/wimezika.pdf
    • https://s3.amazonaws.com/pubopelej/neumonia_complicada_pediatria_2018.pdf
    • https://s3.amazonaws.com/zuxadol/holt_sociology_textbook.pdf
    • https://s3.amazonaws.com/wegemebufojafak/app_for_vizio_smart_tv_remote.pdf
    • https://s3.amazonaws.com/dazemi/65065400563.pdf
    • https://s3.amazonaws.com/tagorarib/33354058663.pdf
    • https://s3.amazonaws.com/xuvamuba/fawujuxo.pdf
    • https://uploads.strikinglycdn.com/files/904774a1-b6e8-414a-9d70-852be2f20943/saints_vikings_prediction.pdf
    • https://s3.amazonaws.com/sezebepit/77259597285.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_off0000eee5.bin
b9effb5327a8d45592bf2ddeee37e016b2706de6751df2d63bda7c9669031099
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 5144 bytes
font_01_sfnt_off0001004d.bin
178a36654e3599ace56c16252780fc9106a31141c2624a866b788a75c359494e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 10216 bytes