Malicious PDF — malware analysis report

Static analysis result for SHA-256 861ae85c229469b0…

MALICIOUS

PDF

79.7 KB Created: 2020-12-25 22:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f86c490de7eab594b13bf73d334a6d47 SHA-1: 74a32ef01cb9f90c5484ec3f733c4f1c78a4ad05 SHA-256: 861ae85c229469b014f984611568cc1f9e5a66faa1ff9ff3b705511bf183468c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one specifically pointing to 'trafffe.ru', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafffe.ru/aws?utm_term=underbust+corset+pattern+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387922/normal_5f91f3382cfa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500895/normal_5fcdd1fe48f19.pdfIn PDF document text
    • https://dironirodog.weebly.com/uploads/1/3/4/7/134760169/wepujujufan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388280/normal_5fc921cf8e1e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/sales_forecast_excel_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc8e4b6e-ec85-4587-b2ce-f2ba4038aa87/dragon_age_inquisition_cassandra_romance.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/ansible_tower_workflow_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/90232819258.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/34507030175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f9c66a-ff5f-4393-9361-c70745c88c99/telegram_x_ios_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/dumarizisesinadav.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_off0000fc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 5248 bytes
SHA-256: e43b1529bfa1af7fd0250726557b5806d0080e49ab675bdaf955d6a27326d2b3
font_01_sfnt_off00010e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E74 10440 bytes
SHA-256: 32d7451be95b70af4525de9d849383c3c19064401787c3643eaef3a081ee755c

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