Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce514e90904e03a…

MALICIOUS

PDF

84.6 KB Created: 2021-03-11 19:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1cf9ba6877c2a0d51e51f6cd8b70f740 SHA-1: 5635d5d95516add98b07741f3112ae17fe860c0e SHA-256: cce514e90904e03a5602cb7a81c3c9cb7bc73e5697dd2e8fb11a056faef668c7
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/strik?utm_term=roland+barthes+death+of+the+author+quote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388424/normal_6045bdb754eb7.pdfIn PDF document text
    • http://beautysale.site/69312577585v7v65.pdfIn PDF document text
    • http://d-youtube.com/67116601500ey2ik.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/wicGjil/juicy_fruit_chewing_gum_flavor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424981/normal_5fc7aeb6b929e.pdfIn PDF document text
    • http://trokot-online.xyz/material_safety_data_sheet_2_4_dinitrophenylhydrazineprm5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422628/normal_600a54553e288.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/d830go3/kigasirinu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474978/normal_60090fedc1309.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/igibyjd/mewalatatizopo.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/togi7ih/wafanisezeninozimu.pdfIn PDF document text
    • https://cdn.sqhk.co/jesarijufe/gjjisRa/coloring_book_pages_baby_animals.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/hbhihjg/classic_air_hockey_table.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/ibjiRhh/jungle_fly_jay_mp3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_6048139958253.pdfIn PDF document text
    • http://questotzvezd.space/pemuwobokiog156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500208/normal_600bc9f9763a8.pdfIn PDF document text
    • http://vk-settings-change.online/461066311137jx2q.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/jiaFggW/bipajavukevovemavefafu.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/hcUjaji/jamexabemeguwinatowij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_c71d2e44fe1c4e35b47e51e6ab9523f3.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_2649b56147e5462cbc070d8c1a57a2a2.pdf?index=trueIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_f91d2effc0fb453583777231f3e4e1df.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 5100 bytes
SHA-256: aecb41ef834126d0d7203210fa82aa56c8479e1929ecb590eb856c0f4d310f63
font_01_sfnt_off0001111d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111D 11292 bytes
SHA-256: 2c2f92db6e3b8b6510ad2d458503b78052539d65a34c69e141c0297e89cc02c3
font_02_sfnt_off00013695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13695 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333