Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ab4e44dd9493ee…

MALICIOUS

PDF

93.2 KB Created: 2020-11-13 10:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2599c1b3810d62a996c46eb66582196e SHA-1: 758474731d244a133bf0ac73c3dc8876e1210c30 SHA-256: c6ab4e44dd9493ee4f058360b6c8bc397f95c5ccbec00ddba06a48c4897fc11e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on striking.ly and appear to be part of a link farm designed to attract traffic. The primary malicious URL identified is trafffi.ru, which is likely used to host phishing or malware content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=is+theravada+buddhism+monotheistic PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421462/normal_5fac4f83deb8d.pdfIn PDF document text
    • https://pesodubebugi.weebly.com/uploads/1/3/4/2/134234841/4354675.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/betajisimokotukileke.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/25047afc-4d27-468d-b06c-00d7818a59e6/clash_of_clans_gem_generator_no_survey.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/58487579565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec2753d7-ef68-4f92-807f-09c74c03f9ea/play_unblocked_games_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a741e034-17c9-402e-b38e-ec3f15d6e712/dc_ultimate_character_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb0322a-5f37-4dd5-a47a-f8ba5298d7f9/doxixolagapenobazezekejuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38a6d4a-6998-4b61-9738-bb083cf93a29/71616559183.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/battle_rope_workouts.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/lawusepabesike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7037a1-ff88-43fa-9d62-59c4aecaf151/facial_piercings_chart_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b11921-13a9-455f-8a3f-f23dc2e6244b/4586711102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53aea4f5-f5ec-4aee-a6fe-3ed6f0bf24b3/45117955796.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off00012eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB8 5284 bytes
SHA-256: c6d83176448016dca8c85ef0c7b14c123d1c5ef251b4e7af0e472e5089759839
font_02_sfnt_off00014087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14087 12068 bytes
SHA-256: 099e646b153115f53afaaa2753996a14f9288f9fe70267c1e3574f0875d4b005

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