Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c81afd75423e36…

MALICIOUS

PDF

84.5 KB Created: 2021-03-25 16:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 484a0e4e3f5f3bf47ee6cad19d6e4456 SHA-1: cfa1c5d5feb3bbecf62f4aeeaa108ad2e6d9a73a SHA-256: f0c81afd75423e3634f9b96800e59457fc4d990cb40a200c61566402e72afd52
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with a significant number pointing to disposable hosting. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content, aligning with phishing or spamming tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/award?keyword=swot+template+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426071/normal_605aa6e07658c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382778/normal_601de02db291f.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/singer_esteem_ii_bobbin_case.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481163/normal_601f312756b0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468563/normal_6051aeda473d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_601ff3056a347.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366676/normal_5fc934fd0e1c5.pdfIn PDF document text
    • http://tasigezagu.scienceontheweb.net/16061509589.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/ba4324.pdfIn PDF document text
    • https://fijuzezakuxulow.weebly.com/uploads/1/3/5/3/135391315/tateboxovi_sukipog_kalikek.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/97139094915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481053/normal_601a607a1c956.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464542/normal_5fcd60e99bba7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453105/normal_605634e5527e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_2b28d6649598462fb1e6671bb28b41d8.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_f9c10aff31cf4929b43575a90b68a5c0.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_9b3c5bc54c58456eabc74798933523a0.pdf?index=trueIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_fb740886d740420e97b836915f05bc7a.pdf?index=trueIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_4bba71a507384bc883129af24c572a41.pdf?index=trueIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_138f2e73bcab4bc3b512828ee884ca44.pdf?index=trueIn PDF document text
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_81eaa18e11014fb597c185fea3b60326.pdf?index=trueIn PDF document text
    • http://davofunup.onlinewebshop.net/ipibl-lb_bios_flash.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_39a09686d6e34cee8e32ab2fb847b118.pdf?index=trueIn 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_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 5108 bytes
SHA-256: 627b0f2845fddb705a15ae64f6124259c43b7e6da110c2395dc976a6bf4d3634
font_01_sfnt_off00011f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 11128 bytes
SHA-256: fc4926f85bff50980f0504edcd51f203c0a0370eaf133131a77ee6bd75821c50