Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b37b433f92e1bd…

MALICIOUS

PDF

92.9 KB Created: 2021-04-02 01:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 35b53fd1b266ace6dea86ed972e59630 SHA-1: 9d2cd1bd2a26f46fab8f986d449a9ca2f792275e SHA-256: 61b37b433f92e1bd2cd76e2be92a72f132b7e4d9ab9b14499105ee555a9c78eb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to host phishing pages or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/award?keyword=an+inspector+calls+act+2+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421462/normal_60623ed651df2.pdfIn PDF document text
    • https://gidisapawifo.weebly.com/uploads/1/3/4/6/134611794/1176406.pdfIn PDF document text
    • http://copyrightprivacy.site/40915664679xq7pv.pdfIn PDF document text
    • https://tigigedilopufam.weebly.com/uploads/1/3/5/4/135400960/3378259.pdfIn PDF document text
    • https://zivumipit.weebly.com/uploads/1/3/4/3/134317334/8f5f12.pdfIn PDF document text
    • http://nakanilo.club/65671626127w4hyg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378175/normal_5fccff3e95d12.pdfIn PDF document text
    • http://sikevemekoma.mypressonline.com/caesarstone_catalog.pdfIn PDF document text
    • http://hotsales-com.xyz/hunger_games_book_series_listvx4ki.pdfIn PDF document text
    • https://rulovuwupe.weebly.com/uploads/1/3/5/3/135386045/pedem-mogox-dogugefojolopov.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/6526507.pdfIn PDF document text
    • https://waliruwixogipi.weebly.com/uploads/1/3/4/0/134016871/8d91d.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/gemedikenfroai.pdfIn PDF document text
    • https://tugesarafexo.weebly.com/uploads/1/3/5/3/135319839/nilugezinad-fuxalanomodupan.pdfIn PDF document text
    • https://nuribivavis.weebly.com/uploads/1/3/4/6/134625990/tafuxofutojofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_602577ba0d070.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a598cd-b8a2-40fc-bd2e-3b9c7d304595/92103768241.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/sewowakemarusi.pdfIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/28519576482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04758e29-8db3-44d7-beb9-4c007ccc973c/85966478886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e82694-20b1-48ad-ba6a-3527852246c5/99217988393.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_off000130eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EB 5268 bytes
SHA-256: 4c4a0daaede9347423bf0b0535fade58d74e952e1a328b63452c639cd264b0a6
font_01_sfnt_off000142e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E5 10432 bytes
SHA-256: 71975245be886d6274e78c4166655f8e7ebe4c42574970dfcdbe00fe687adf23