Malicious PDF — malware analysis report

Static analysis result for SHA-256 3605231cc887f224…

MALICIOUS

PDF

76.4 KB Created: 2021-03-03 12:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2ea48e09ada08b43d0d8ae8fc4dc5ff0 SHA-1: 3d079e598e725c9bf65dc556ce5904a81aff2875 SHA-256: 3605231cc887f224e09f602743710c43097349b28827e297e62129fd72beab56
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of numerous external URIs and the 'PDF_SEO_LINK_FARM' heuristic point towards an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kuzutuzo.ru/award?keyword=digital+design+6x9+speakers PDF link annotation
    • http://pekebanabotariz.66ghz.com/effective_conflict_resolution_and_teamwork_skills_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/sopaluwokaja/TBarCvv/best_apple_watch_black_friday_deals_2019_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/OKngcpX/88048943636.pdfIn PDF document text
    • https://mepalowe.weebly.com/uploads/1/3/1/0/131070826/desesofatiloxobo.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/i9hLhhm/jokim.pdfIn PDF document text
    • https://rivabugejovo.weebly.com/uploads/1/3/0/7/130739095/956df075e6c4ace.pdfIn PDF document text
    • https://cdn.sqhk.co/daxozazon/ho5jefQ/college_football_live_streaming_app.pdfIn PDF document text
    • https://jumugixaz.weebly.com/uploads/1/3/6/0/136028190/2955403.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/thbjb1X/patanjali_yoga_sutra_book_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/VG4ihhk/82852906438.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/e6931efbcf4.pdfIn PDF document text
    • https://cdn.sqhk.co/wexapitode/CmNjidr/pro_series_drag_racing_5._8_tune_camaro.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/hgggiem/goons._io_knight_warriors_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/jjgcgeW/code_editor_ide_tool.pdfIn PDF document text
    • https://kawijidaxo.weebly.com/uploads/1/3/4/8/134891868/1448015.pdfIn PDF document text
    • https://sadavixiji.weebly.com/uploads/1/3/5/3/135333995/47ac51073bfc1b.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/mezedok-milopu-judemarosob.pdfIn PDF document text
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/7ade60b.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
    • http://jemileti.atwebpages.com/why_is_my_dryer_stuck_on_sensing.pdfIn PDF document text
    • http://tinurewewe.rf.gd/46533168328.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/50734512062.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 5248 bytes
SHA-256: b2e6a35eb44d5aa8a8a15fbc2e869404482b65994053dfe6f9b320f9b206c695
font_01_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 10072 bytes
SHA-256: 4c0e78d883a1a333436a59a1c5e456115c0f8bb5582efd176973c41f8ac5308d
font_02_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71