Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bf90f435970c6c…

MALICIOUS

PDF

70.3 KB Created: 2021-02-03 15:00:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4b45bd135e3ab64089f794cbd1e1c1aa SHA-1: 9b687bfb2c6ffc5ad8cbff3f999959f8df50526e SHA-256: 76bf90f435970c6c692bd8157463517632f714e4af644fa6acde649bd5291567
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=nightmare+on+elm+street+franchise+trivia PDF link annotation
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/ranubumu_fumalilupojup_linowenep_wozuvosino.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/jozalerodatakarof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378155/normal_5fc6b3cfb9526.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/zejefosa.pdfIn PDF document text
    • http://reduslimitalia.site/dish_network_dvr_hack0cebx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416318/normal_60128a051eb52.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/7490686.pdfIn PDF document text
    • http://cashbackk.site/zubis36ebr.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/doxod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fe9d6d8ad15a.pdfIn PDF document text
    • https://lixepugoguzezum.weebly.com/uploads/1/3/4/1/134132265/1753263.pdfIn PDF document text
    • https://pilonalamajavex.weebly.com/uploads/1/3/1/1/131164122/34026ef5e5cb.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/ihidgfk/lullaby_songs_for_baby_3_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/hbyjgjc/mobile_credit_card_machine_for_small_business.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/jibijkE/4087366302.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 5324 bytes
SHA-256: fa243d5b96c617b4c82583173a02200663ef0caf45d3f37a865a33f3fec96b1d
font_01_sfnt_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 10416 bytes
SHA-256: 24f572f7e12dd2c8e57f8b22e9f658811485533801681822c5f9b5f40af0ffea

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