Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdee72b7f8c57f1…

MALICIOUS

PDF

70.4 KB Created: 2020-12-29 19:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05a9c1045a808cd98357c091fc994436 SHA-1: 65d3caa1f5c4b19a4afc1e5d8752ec6e5044317b SHA-256: 7bdee72b7f8c57f18d4ad2962761607bfb6c12b8170600eb8470bf1c3ebe4632
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One such link is to 'trafffe.ru', which is likely part of a malicious campaign. The ClamAV detection and ML classifier further support the malicious nature of this PDF, indicating it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/strik?utm_term=live+wallpaper+iphone+11+gif
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/56c17dd22.pdf
    • https://static.s123-cdn-static.com/uploads/4469626/normal_5fe4b2297d4cd.pdf
    • https://cdn.sqhk.co/sevimifogu/fii2Fhf/sowovumewineveb.pdf
    • https://cdn.sqhk.co/ludibipimilu/MwXQyji/80796793340.pdf
    • https://cdn-cms.f-static.net/uploads/4444657/normal_5fe8df3a5d669.pdf
    • https://cdn-cms.f-static.net/uploads/4375210/normal_5f8a813a513ab.pdf
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5fa5df2c4ac37.pdf
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/66d2dccd4.pdf
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5fb4b0f350797.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/53d670a3-93d0-4aef-a724-4a1aeb26dd92/pokemon_soul_silver_rom_download_pok.pdf
    • https://uploads.strikinglycdn.com/files/eff6cabd-f9a6-4cfd-9ab5-2edb1226c0ba/82219525453.pdf
    • https://uploads.strikinglycdn.com/files/8a12ce2e-07f5-44f2-a34d-388f959c3943/5603860547.pdf
    • https://uploads.strikinglycdn.com/files/23236f6a-feaf-4308-b33c-52d48f374600/cuisinart_toaster_4_slice_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5dd.bin
bd0c66c40146b8b55da3675028a68a47f2e05205de3a057e98a3fa660591ed1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 5132 bytes
font_01_sfnt_off0000e773.bin
67f2b62bc4b944d930bf61687444b1523b4dd919267834d3863d68ab69964153
pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 10972 bytes