Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9f7c0c56c725a1…

MALICIOUS

PDF

79.3 KB Created: 2021-02-19 06:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 08e29f71ea9ff843fc0ff820cbb2dddd SHA-1: c90b8f61cd365d529b2db9b70dd42ab175d8b48f SHA-256: 6d9f7c0c56c725a132ddfc0b83bc31e2c3efcc546e722d4a15736cc45bc28ac8
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 probability of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, with one prominent example being https://jottigo.ru/123. This indicates the document's primary function is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=les+trois+mousquetaires+film+complet+1961 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393791/normal_5fd6d5c6a0b17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371244/normal_5fe48cf89e1e3.pdfIn PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/9032933.pdfIn PDF document text
    • http://good-production11.site/peaky_blinders_season_2_in_480p3x0ts.pdfIn PDF document text
    • https://sifuparara.weebly.com/uploads/1/3/4/3/134352995/85509c0795f0.pdfIn PDF document text
    • https://toromadon.weebly.com/uploads/1/3/4/5/134523466/3230407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416502/normal_602b77f7d9043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380237/normal_5ff1595b4d1af.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/paxunu/73484708079.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/megejagin.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/basic_auto_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/iseek_answerworks_quicken.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/cave_story_psp.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/28639743673.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/22080520476.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/56348364634.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_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 5592 bytes
SHA-256: 4e99d247f5f2ac9aaa1fb4f3be1a49aca114c98230fe3cc1b5ac4c6f03c344d2
font_01_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 14140 bytes
SHA-256: c9fa83e4ce3d3e80efdf0741240b3150844f9fe687efc402d3bc75ec7b353ee3

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