Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d334fedd3b5d096…

MALICIOUS

PDF

84.4 KB Created: 2021-03-02 23:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 26f6b7a41c893f887f51ec8ff3efa074 SHA-1: 0801ece411983bdc4528fcf489eba0334b76d092 SHA-256: 1d334fedd3b5d096031773dd3da9259b5346bf41ed3d4bb8bb5df61537c25687
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, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/strik?utm_term=who+are+famous+magicians PDF link annotation
    • http://bafiselavanebep.mywebcommunity.org/zegalipuvutadubokejukevi.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/3hbjhTU/sukawuderevofojebu.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/what_is_a_shop_drawings.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/hpcy9ia/green_skin_dungeon_master_soul_stone.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/nilitazesew.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/y1A00ia/datakozemegubusimolopis.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/hfgehaP/juloxa.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/ShbUgja/90227714475.pdfIn PDF document text
    • https://wixetaduzem.weebly.com/uploads/1/3/4/4/134471786/4416303.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/zatididizugananupaxapo.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/he8ibpP/25580538984.pdfIn PDF document text
    • https://cdn.sqhk.co/rizavoxaje/gxgcgeX/74665290195.pdfIn PDF document text
    • http://nuxokavarop.22web.org/pevunumemaruruwugimo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keregimuw.onlinewebshop.net/83896926106.pdfIn PDF document text
    • http://kikuzekoxo.rf.gd/evenflo_tribute_5_convertible_reviews.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_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 5276 bytes
SHA-256: 1270ce0e6feff73780fc70f2f3ed07a906dd1e63bdc45ba615a2e52a8b4a6d3f
font_01_sfnt_off0001172b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 14840 bytes
SHA-256: 1f7d63776935c85290c7ecab563d86276789ce83196d062e352c9421c1a7c5b6

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