Malicious PDF — malware analysis report

Static analysis result for SHA-256 be027201e28e0f82…

MALICIOUS

PDF

79.5 KB Created: 2021-03-24 14:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: da238e621ea33c8b6c8f5d123adf647c SHA-1: eb64afdb4cf8bbcc39d08a0acebb90a0351e7892 SHA-256: be027201e28e0f8268dce307a71fd51e16c857b64782fb0df0e53b73ad13d949
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/123?utm_term=minecraft+carpenter%2527+s+blocks+1.+12.+2 PDF link annotation
    • https://dosijusesuxola.weebly.com/uploads/1/3/4/3/134305349/a4b8b08c6d97a8.pdfIn PDF document text
    • http://ubsvp.com/algebra_2_common_core_textbook_answer_keyek5zi.pdfIn PDF document text
    • https://luvegiramoki.weebly.com/uploads/1/3/3/9/133986347/volizav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5fe97174acab8.pdfIn PDF document text
    • http://uscarinsurance.info/7801466109073oen.pdfIn PDF document text
    • http://cmb-eco.com/23693302469shkfy.pdfIn PDF document text
    • https://tixaradizu.weebly.com/uploads/1/3/4/6/134652762/limim.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/8729c.pdfIn PDF document text
    • https://jalagowozitaj.weebly.com/uploads/1/3/5/9/135967583/83403.pdfIn PDF document text
    • https://xogudefimo.weebly.com/uploads/1/3/0/7/130775634/medenafisatudus_wuxetoz.pdfIn PDF document text
    • http://zoomita.space/haven_and_hearth_combat_guidekxsgx.pdfIn PDF document text
    • https://pogunokele.weebly.com/uploads/1/3/0/7/130739789/siradikakim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415055/normal_605372f28778b.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/1GHXdni/61471378141.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/ghgjhal/duzedigodomaravidakexu.pdfIn PDF document text
    • http://uscreditreport.info/good_sam_2019_dinghy_towing_guideczibn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_605053d23bd2c.pdfIn PDF document text
    • https://desagudag.weebly.com/uploads/1/3/4/6/134676200/18b882bd0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_603611f71926a.pdfIn PDF document text
    • http://meetchambre.xyz/city_of_bones_book_summarywbs2g.pdfIn PDF document text
    • https://cdn.sqhk.co/bewagolene/c2jto6H/44048945148.pdfIn PDF document text
    • https://cdn.sqhk.co/varugefezum/jgjeUwR/59636555144.pdfIn PDF document text
    • http://prostotit.site/simple_valentine_cake_decorating_ideas4d7oz.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/jangegh/automotive_shops_near_me_open_today.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 5468 bytes
SHA-256: 3e35bed6c5dbae7b51071ff831f4244b7321385287fe28d0cd52440862b6e4d4
font_01_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 11336 bytes
SHA-256: ed0febf35001e8ffb90af0a0d85a2df15e3fe451787518539a537cd247db904c
font_02_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 16064 bytes
SHA-256: f7fb55aa7df24da556f1e6a14ff3e973b5c7274e6851c040e899454d18355684