Malicious PDF — malware analysis report

Static analysis result for SHA-256 5214b3e37b831f3f…

MALICIOUS

PDF

68.3 KB Created: 2021-01-06 21:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 745f8ecee1c6b753562bd4ca32863b1c SHA-1: 77548861436822c4df35c69e29891053e6ba4b68 SHA-256: 5214b3e37b831f3ffd2d401176f5d7c57963c10343c34e958b0217f7124fc15c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URIs, with a critical heuristic specifically flagging it for mass external PDF links. The primary malicious URL identified is trafftec.ru, which is likely part of a phishing or spam campaign.

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://trafftec.ru/123?utm_term=chest+physical+therapy+contraindications PDF link annotation
    • https://bezubimuxidisa.weebly.com/uploads/1/3/1/4/131453869/68a4d381742d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499942/normal_5fbf1d8edf6c2.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/gfiakrk/screen_recorder_capture_audio_recorder_video_editor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5f9ed2644c184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_5fdbcaaa1ef6a.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/e315ea09-b1af-47b0-858a-37d10fc7ed6f/27726663527.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/article_format_class_11_cbse.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/tuxemeroxuturikij.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/report_burst_water_pipe_london.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb3f2ea9-cee9-42e3-821a-ff4f62bbe081/85627878811.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/challenge_2_hd_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d12673c-f760-4966-a275-874f025573c1/49267615557.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_off0000d0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E2 5168 bytes
SHA-256: 892a69248458347192d4b7996ebe24654f0f96f69bc9f991baa33529ffa51c67
font_01_sfnt_off0000e270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 9968 bytes
SHA-256: bc5afd9985994ce57544c9da27f642fc77677bccab3577eb544cd1e1b327749e

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