Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf68285d44d9997f…

MALICIOUS

PDF

89.0 KB Created: 2021-05-06 00:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 02a275ca5df71f3370de7dd921fca78a SHA-1: 5426e4aaa9aa78f9b9264dc00fb6778f402df20d SHA-256: bf68285d44d9997f602a06896e798f4f580c2a3d96993d7d5082f723c998ca6c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/strik?utm_term=denon+avr+1613+service+manual PDF link annotation
    • https://lagomide.weebly.com/uploads/1/3/5/3/135304015/pavelamojibezunir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_600c494788502.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470401/normal_5ff0296741162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_606e3d560cf87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_602774c6c6f62.pdfIn PDF document text
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/51785e3513c23b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458856/normal_5fd8b9588849a.pdfIn PDF document text
    • https://pozesipo.weebly.com/uploads/1/3/5/3/135346015/fetotuvaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5fe993ac52ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_6033cdccdf8da.pdfIn PDF document text
    • https://nulabelavomeviz.weebly.com/uploads/1/3/1/4/131413951/vibiref.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382974/normal_600139bf961e1.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/organisms_in_an_ecosystem_compete_only_for_food.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_601f70f4d2828.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_642b5a6c8f824084ad51c8997948bb88.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_5430d01fef434bfa961234e80b004806.pdf?index=trueIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/70119860946.pdfIn PDF document text
    • http://paguxesij.myartsonline.com/15260112297.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_02bde355b9b44beb8932e6446a50eff6.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_c44e91ef68bf4872b99caee10dfb3a67.pdf?index=trueIn PDF document text
    • http://vorisenunajix.myartsonline.com/built_with_science_shred.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_fd39eb9ab4f9449cadddfa2a276ec2bc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 5176 bytes
SHA-256: f28da1c7818edb30858a295804f1d7895777a6fde9da11c5b87692bb950056d6
font_01_sfnt_off00012289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12289 11176 bytes
SHA-256: 66ed58904c06c1e16c9a0d43455db8de0e2ae1e30fbb051ddf92483deb410123
font_02_sfnt_off00014893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14893 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e