Malicious PDF — malware analysis report

Static analysis result for SHA-256 c942caa0faeb52a1…

MALICIOUS

PDF

73.1 KB Created: 2020-11-29 19:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 648467bf3565b96b57798287f09621a6 SHA-1: 18d7b2c90177410ff098132fca7e5405a5f85758 SHA-256: c942caa0faeb52a114b1adb8aa004bf6668c0e912a9258bc98974c83e5f59f88
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to drive traffic to external URLs. One such URL, 'https://traffnew.ru/123?utm_term=gattaca+movie+assignment+answers', is directly embedded and appears to be the primary lure. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', suggesting a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://traffnew.ru/123?utm_term=gattaca+movie+assignment+answers PDF link annotation
    • https://nisixokavenofaf.weebly.com/uploads/1/3/4/8/134891603/rivugekexabetozi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/fleischner_guidelines_2017_radiology.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/negative_velocity_on_a_graph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9271cc-0f66-40d9-996f-c3ab182fdf3c/31356868088.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/vulajakuvewuwipikune.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/the_lady_or_the_tiger_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/58359830673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72c19903-8534-49fb-b6b5-fc0ebfcf5e4f/checkpoint_ccsa_study_guide_r80.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/bhojpuri_new_video_song_website.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 5060 bytes
SHA-256: 54978f1ca2adc1ed3a4334484bc7bdd157b7ef678aa14432e3a6a2ea2b45f099
font_01_sfnt_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 12604 bytes
SHA-256: d918074ea7e6df0f90d5b7779e1be79a5d66c484d9822a36800061cf78c64816
font_02_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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