Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d3b2490c3c94da…

MALICIOUS

PDF

66.2 KB Created: 2020-11-13 07:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 25232cccfee232ca97cdd382c67d3472 SHA-1: d1a489314b42d11810fe286c0b8c76ad8f38d530 SHA-256: 22d3b2490c3c94daae4ecbd081c6cd4de0c0aadc370e6ecf9065e00f61b5b167
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one to 'trafftec.ru', suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, further supporting the phishing or malware distribution vector. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=license+plate+template+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5fa55f1f1481a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f87c79e00ebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5f99300930e88.pdfIn PDF document text
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/4225371.pdfIn PDF document text
    • https://giwirakixa.weebly.com/uploads/1/3/3/9/133999144/3733844.pdfIn PDF document text
    • https://menedusuwoguv.weebly.com/uploads/1/3/4/6/134699995/bfdf49d090d8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466664/normal_5fa3f26bb0e8c.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/wixanarer/numeric_and_geometric_patterns_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/bfb_characters_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3563fef4-939e-44e2-8899-25e5162c23e1/98971778842.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/dobepozijur.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/51239558571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74fe21db-147e-4a4f-8a3f-4f04d1062959/bajakoruzelugaj.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/89780671666.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_off0000c7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D7 5148 bytes
SHA-256: c82e67a39b4fbb06bb6d45191686d222c983bcba9d30e6202cab5012390c7755
font_01_sfnt_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 10208 bytes
SHA-256: 13af42647ace207b0fc21c6f3d662bca0f6c97f569fa827c7e3f6df507b10bee

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