Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9462d01d91ce20…

MALICIOUS

PDF

71.3 KB Created: 2021-02-15 22:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e188e9f599ad57f69e6c62c782597181 SHA-1: 049a2d6d95dde2a5564448a191d3431ce4a15959 SHA-256: de9462d01d91ce204bab24519439e8d7cbba7b57a6691ad3ec1b4fff6e21406e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, particularly those on disposable domains and using UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, which can be used to generate PDFs from web content, further supporting the link-farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://maypoin.ru/123?utm_term=krk+rokit+5+g2+used PDF link annotation
    • http://appeal-ig.com/nudovarofadq6r5t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421056/normal_600edbc37f945.pdfIn PDF document text
    • https://romarifekaxa.weebly.com/uploads/1/3/2/6/132683260/pozilokuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414677/normal_5ffb90b9cfff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_5fdbdf675d8c1.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/gelekezumugavimik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_5fd8d4c42e662.pdfIn PDF document text
    • http://natlab.ru/games_made_with_mit_app_inventori9cxv.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/freestyle_2_pf_status_guidefkb5j.pdfIn PDF document text
    • http://remont-pc.website/16457331377qq95i.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/94796373693k3129.pdfIn PDF document text
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/6134965.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5ff422566a1b3.pdfIn PDF document text
    • http://energierecrute-emplois.com/monster_truck_offroad_chase_racing_legends_hillsboroughp7y52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mukut/2659229603.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_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 5040 bytes
SHA-256: 16a6c56fc853addadf99f9defe30b7b0e1eedf66cd1df3ad60d84fc22ce6f5dd
font_01_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 10792 bytes
SHA-256: 087989889d18edf94fa4d9266522dceba7c9ac3f7b9dc3d7d9c8cca904599c4f

Open this report in the interactive analyzer, or submit your own file for analysis.