Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c27eb8d6d08e0ed…

MALICIOUS

PDF

75.5 KB Created: 2021-02-10 22:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6e2b9f2ec7f226127df7b270cccf14e8 SHA-1: 3f15ea932e15001d47e60951cf72534a71a7e539 SHA-256: 6c27eb8d6d08e0ede798b35f59bae48082d6cc72cbc0e8c23db962afec97d80d
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 hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wb?keyword=automatic%20vs%20manual%20transmission%20reliability PDF link annotation
    • https://salufisudad.weebly.com/uploads/1/3/2/6/132695294/9305907.pdfIn PDF document text
    • http://amorexpo.com/38483634068s7k6a.pdfIn PDF document text
    • http://ericksandoval.com/vladimir_propp_morphologie_du_contenpmdi.pdfIn PDF document text
    • http://albl.ru/pelicula_mas_alla_de_los_sueos_en_ene0b2.pdfIn PDF document text
    • http://chategratis.online/mojer9qh58.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/viworuxopofew.pdfIn PDF document text
    • https://kajukijuxuvame.weebly.com/uploads/1/3/5/3/135329863/168d0.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/bheQpib/saxarazoginetelawuwebu.pdfIn PDF document text
    • https://xefezabegeritaj.weebly.com/uploads/1/3/1/3/131379478/vawejazesupuzejo.pdfIn PDF document text
    • http://prizinsta24.online/karnataka_cet_2019_physics_answer_keyae9aa.pdfIn PDF document text
    • https://vigegenatiborig.weebly.com/uploads/1/3/0/7/130740049/3374295.pdfIn PDF document text
    • https://cdn.sqhk.co/nepopagugela/ihMZHjG/casse-_o-_player_1970s_cassette_pack_free.pdfIn PDF document text
    • http://steblin.pro/5741656440389zwp.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzewekafan/cphc2hh/lajulab.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/dOhbjhm/50660615381.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://s3.amazonaws.com/bomupi/magadawofepisujudeni.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/92384707323.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_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 5120 bytes
SHA-256: 7683d06e156350d31936f316219b48357b89d8b3777f6fa73c9bbfa94f9f5256
font_01_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 10116 bytes
SHA-256: 9fdc1550a91327038cc3927bd4be7612d3ccf3ceba9e71362f77f1af7c047f11
font_02_sfnt_off000112b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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