Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a683ad375df745…

MALICIOUS

PDF

77.2 KB Created: 2021-02-22 16:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 54796a54eabbc2ddec02bd8646a4fb86 SHA-1: 7834e6db98b677e9be246fab70622bb593a9d8b4 SHA-256: c3a683ad375df7455c0d4f8f0d6e6d892730eec93aa707ea592f30389b3c7ebe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm redirecting to a search query. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or ad fraud. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious websites.

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://leonvi.ru/strik?utm_term=diary+of+a+wimpy+kid+book+list+printable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426551/normal_601e6412e0dbc.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/xozevolusofexax.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/hzqjcDJ/sonnys_menu_calories.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415974/normal_5ffc89c870cff.pdfIn PDF document text
    • https://vanakiti.weebly.com/uploads/1/3/5/3/135323710/eff38670bcd.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/cQdhazr/nupilulilakebulevop.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/2ORjbyf/mini_dachshund_breeders_pennsylvania.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/jusagi/how_much_oil_does_a_honda_gcv160_lawn_mower_take.pdfIn PDF document text
    • http://rogofijanititad.epizy.com/tufivekobas.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/video_er_app_for_android_2018.pdfIn PDF document text
    • http://litaxuroba.rf.gd/borderlands_1_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/a2_envelope_liner_template_free.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_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 5584 bytes
SHA-256: b10764c86c75897f2caa913656db941ca05ddbe25b02f45230500cff140f836c
font_01_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 11444 bytes
SHA-256: ae33450dad1a4e81a8eec8eaf20ecb126a96024c921373a685da26c215f346c8

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