Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d28dec3a237bc70…

MALICIOUS

PDF

65.4 KB Created: 2020-12-18 22:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 234ee39d221b3f495fe103f4468ee773 SHA-1: 77de3fa402fb3ff79e6ea10460ced5dfdcf90118 SHA-256: 6d28dec3a237bc7075aeeb85e0c50d37825d0a2321a0eb3b1d75fc0268317099
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, directing to various PDF files hosted on external sites. The primary malicious URL identified is trafffe.ru, which is likely used to redirect users to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=bed+bath+and+beyond+ventura+blvd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476011/normal_5fd91409a915b.pdfIn PDF document text
    • https://kofusozefo.weebly.com/uploads/1/3/4/5/134515267/webaz.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/lubev-pikex-narupopebik-kozemib.pdfIn PDF document text
    • https://mabufome.weebly.com/uploads/1/3/4/8/134880487/235f7d4c9.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/7989682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_5fd5fe9602d22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b51298d-99d5-401b-a79c-5dbb2240667e/40303087227.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/farexugokefiduxawanubiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8578f8c-a1ae-4dfb-93cb-8419e7fe4c0b/66579192021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ca9159-4698-4d2f-8f99-45d2ec47e14b/zamedoxixokubopavasake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac8c32cf-57d3-45c3-923e-c88dc9854001/36365717446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f11434-0211-4d8c-ba01-e9ec7d619dbc/jedexonif.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/ideal_gas_law_worksheet_answers_carson_dellosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6b9af9-2538-41e5-826e-883bd4cca7fc/8774036269.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_off0000c191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC191 5088 bytes
SHA-256: 5b1b35ed43a90437046aa532746296d18028ff18e89a77f57b9709679abbd8fb
font_01_sfnt_off0000d2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 10748 bytes
SHA-256: 7ef50cb7a31271c2230976abdf95d748f2aa0dfb7fdd9d9805f52632ff4d9da1

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