Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62935a73271fcfc…

MALICIOUS

PDF

67.9 KB Created: 2020-11-29 08:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 194cc3ff7e41dc6dd5323f904a5f6980 SHA-1: bfdacea31f9e34dc235885701cd020f8e0dcb987 SHA-256: a62935a73271fcfc69ab4e88c5483e1c7384c864fa9f9b29a5c262e9f392bb43
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of numerous embedded links, many pointing to disposable domains and some identified as redirectors, strongly indicates a phishing or scam campaign designed to lead users to 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=hacia+una+arquitectura+sostenible+pdf In PDF document text
    • https://dexoxewivovevub.weebly.com/uploads/1/3/4/3/134322619/5751415.pdfIn PDF document text
    • https://lozusometuzasop.weebly.com/uploads/1/3/4/7/134741376/2891818.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/xipom.pdfIn PDF document text
    • https://kirimanadawa.weebly.com/uploads/1/3/4/3/134383910/zexolusezuvo_fasefemenisubuz_sofari_rogunefoven.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/8285579.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/wenireseze-wosirojizisij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410447/normal_5fa282ad11fc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5f9a85058af23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_5fa79a8f2f834.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/1bd3d95d-95d3-4ae6-9211-fef1e6690249/pukerunoxafisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cb494b3-cbab-4346-aa53-383472f27c47/2nd_grade_agenda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f857d99-b98a-45fc-baea-2108c4895028/75740867407.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_off0000cad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD4 5376 bytes
SHA-256: ce85d96fcc0f791c254125cb030bc67852e8b78f0821183343465f882db78952
font_01_sfnt_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 11008 bytes
SHA-256: cb2406692dfc2ffcb552b8c4911977c6e3ccd7eccce40e3dfc3f79f6f0737e4d

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