Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d35cdc8f191c84d…

MALICIOUS

PDF

73.3 KB Created: 2021-05-06 08:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f58ef29ed4b18397e9d582c9cceaea16 SHA-1: 35a56538b8ddf7e3b2478be31eeb39f0984d0111 SHA-256: 5d35cdc8f191c84da95622afa68778490338d19847b5e02a6658050aa4126620
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 SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://xezojetit.ru/strik?utm_term=types+of+curriculum+vitae+template+uk
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/3d2c55e22519aa.pdf
    • https://fejilexa.weebly.com/uploads/1/3/1/1/131163980/4232342.pdf
    • https://xijofufakeziti.weebly.com/uploads/1/3/1/3/131380729/3410416.pdf
    • https://fotelosalif.weebly.com/uploads/1/3/4/4/134463398/3c5d21c.pdf
    • https://tunikasas.weebly.com/uploads/1/3/1/4/131438809/jugemawebula.pdf
    • http://nikibolerobika.getenjoyment.net/nebixoda.pdf
    • https://kexulisil.weebly.com/uploads/1/3/4/7/134762119/dosaza.pdf
    • https://sojomirolasa.weebly.com/uploads/1/3/4/3/134325131/2dd59c.pdf
    • https://jenodefutufute.weebly.com/uploads/1/3/4/3/134373351/pizana.pdf
    • http://xadazobisisim.scienceontheweb.net/10744441998.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_dd5c7d139f79402180d27f7924b0f0a8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c62cf60-4f1a-4d26-8283-5fe83109ac4b/satekonukefu.pdf
    • https://uploads.strikinglycdn.com/files/3f22b4ce-8cc0-4f78-96ab-5e9e4fb69d0d/the_importance_of_report_writing_in_an_organization.pdf
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_2b736d4fc64246b2a47f35afa2842281.pdf?index=true
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_67f48f8bcead49c9a4104c98c72fda2a.pdf?index=true
    • http://paxerakomis.onlinewebshop.net/42942751095.pdf
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_d7eb91513aa144c28027109ac74e9a13.pdf?index=true
    • http://kosezofejesuxef.atwebpages.com/50604094837.pdf
    • https://uploads.strikinglycdn.com/files/db1beb56-fb82-4c53-9583-bd60ecc97c7f/70803985418.pdf
    • https://uploads.strikinglycdn.com/files/0c4180fd-332e-48e1-8816-fd49e5e68af5/43382218935.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e184.bin
eb57849bee1c00c451a66e490cdeda16312dea582d4657cf87468b9956abcaa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 5336 bytes
font_01_sfnt_off0000f3a8.bin
9ef872cced9410886b0ffa029f247a0109b10ffa47179893b51e0d352cfd8556		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 10112 bytes

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