Malicious PDF — malware analysis report

Static analysis result for SHA-256 46da4deaf537ca05…

MALICIOUS

PDF

61.6 KB Created: 2021-01-06 19:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 07c900bb8d7a78de2522177949f05c3c SHA-1: b188caeff53d91a0d74bb1d60e57e75ef7cce249 SHA-256: 46da4deaf537ca05c4b4b1747956b0206bd8daea088b62a3ceccfc74b866c1da
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, https://trafficel.ru/123?utm_term=lincoln+street+school+worcester+ma, is directly embedded in the document. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware via these links. No scripts were extracted, but the structure points to a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/123?utm_term=lincoln+street+school+worcester+ma PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415527/normal_5f9472c81da46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451754/normal_5fc1f9b05a463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5fabd0593598f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f963b3c7bd6b.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/rekazov.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/1394224.pdfIn PDF document text
    • https://tizomejina.weebly.com/uploads/1/3/3/9/133997236/fobozarafutaze-repopulu-jositoganepi-zizoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414489/normal_5fe1605d6675f.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/6bc273e6-db75-4b90-a336-e0eb619ac7f9/kivixifasajokijozaterunaz.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/55796080455.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/converting_degrees_to_minutes_and_seconds_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/adeste_fideles_satb.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_off0000b6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FC 5072 bytes
SHA-256: ffb07e34a9a6b452b633138c6512a05f3b8b9ea90ee0bf23df7ba8bc0d800a5c
font_01_sfnt_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 9932 bytes
SHA-256: ce8c70e6784b89c7bc00fca264d6bb3a21c5ba01f6973295bc9fb57ed06161a5

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