Malicious PDF — malware analysis report

Static analysis result for SHA-256 f880182e395ca44d…

MALICIOUS

PDF

91.1 KB Created: 2020-12-27 11:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2da0a7a8751dc3754c2506067a0b8b4d SHA-1: dc4450b791078eae043d1141f8fcaa1afd4d09fc SHA-256: f880182e395ca44def2f1f4534aad8f003360cc2813e84f035199ccc8c8e08df
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document exhibits characteristics of a phishing or SEO spam campaign, indicated by the heuristic 'PDF_SEO_LINK_FARM' which detected a mass of external links. The primary URL, 'https://traffset.ru/strik?utm_term=fun+math+race+car+games', suggests a lure disguised as a game to attract clicks. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a phishing document or a link farm for SEO manipulation.

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://traffset.ru/strik?utm_term=fun+math+race+car+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417429/normal_5fa7ee57b94d1.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/chfghjh/marble_machine_song_tabs.pdfIn PDF document text
    • https://fofexajadovobu.weebly.com/uploads/1/3/4/7/134711713/5861071.pdfIn PDF document text
    • https://cdn.sqhk.co/kefesizo/cljhVih/mancala_online_free.pdfIn PDF document text
    • https://gilowowiwojet.weebly.com/uploads/1/3/4/3/134314399/totamaz_rewususebu_xirupotav_telusuzoti.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/e62dd937.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/65ede6e6-8e20-4099-b06d-cb25c6ad08cb/10982760388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef16d13-6184-462c-94a7-0a9d1c3d5f11/staad_pro_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1fa0dd1-ab2c-4a6d-8012-a55e44e76518/norton_field_guide_to_writing_4th_ed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252d2b9d-78b2-4531-b5cb-96baa03c7d34/jelipadaxigisitan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b9033e-b93d-48ef-a2d7-a14bbe7f8140/warobenabofojanonerofiluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286b4e90-8229-4e9c-afe3-07d25531d89f/gosonexaneruduru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f231a0a-171f-45e5-b2e1-997558cb159e/bumotufigebigaku.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_off00012b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1C 5136 bytes
SHA-256: c6a8ae8640cdeb7ac006bac82669f62ddfa57ec7dace73c96a68d027328967bb
font_01_sfnt_off00013c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C65 10356 bytes
SHA-256: 3184ebfdce9de6a7572bb44b5b77613633c042c2908b0db04289e57b7f405aae

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