Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6379271f387cf20…

MALICIOUS

PDF

62.3 KB Created: 2021-01-14 01:12:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 90f6c195c7e9772bd0bf3556f91b016e SHA-1: 7a478a690d2120063071001bf1bd110da25bdfbe SHA-256: d6379271f387cf2090983627e7cffea27abc702167982d9106b9e5dacaef5b7a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?utm_term=primaloft+pillows+bloomingdale%2527s PDF link annotation
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/5561812.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/hhhObih/cheat_city_racing_3d_mod_apk_techylist.pdfIn PDF document text
    • https://site-1174733.mozfiles.com/files/1174733/colors_in_spanish_for_kids.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/yBygdjc/amazon_prime_music_family_plan_promo_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506170/normal_5fbe97e4eb0b1.pdfIn PDF document text
    • https://site-1083678.mozfiles.com/files/1083678/36081225785.pdfIn PDF document text
    • https://cdn.sqhk.co/rejinujo/icXjdjd/kozabizisazexe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422893/normal_5fcdb2459af71.pdfIn PDF document text
    • https://cdn.sqhk.co/fetebutujo/bRULphc/lekanuboxevifilavexabiwok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462362/normal_5fe4dec737bd5.pdfIn PDF document text
    • https://xuzofetix.weebly.com/uploads/1/3/4/3/134371052/ac223cdeb.pdfIn PDF document text
    • https://site-1234924.mozfiles.com/files/1234924/edward_and_bella_images_free.pdfIn PDF document text
    • https://site-1178226.mozfiles.com/files/1178226/joteru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92A 5628 bytes
SHA-256: 173f053383c4dcce73eb94f82b3f3db27c23eaab2c72212b465476b86d5aa2aa
font_01_sfnt_off0000cc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4B 9492 bytes
SHA-256: 9f2a69f4299149a4621a3d04b1e2dc9f6aa023de31ad918634831cb28f0d5b7c