Malicious PDF — malware analysis report

Static analysis result for SHA-256 584a85e825d69c5e…

MALICIOUS

PDF

76.4 KB Created: 2021-04-19 00:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2527ede8fcb39a92e7900610adc0d9dd SHA-1: 7a65ad39da6d840b2ad3cfa30673531636c8968c SHA-256: 584a85e825d69c5ea3dd661a9947386cc7aca65c3bfff49286cdb6f44761cde3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to exploit users through deceptive content and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=microsoft+10+for+dummies+book
    • http://kilekapalovuzo.getenjoyment.net/pet_oriented_child_psychotherapy.pdf
    • https://pasugewu.weebly.com/uploads/1/3/1/0/131071180/962d4beb.pdf
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/jerezizi-rajawarizi-joxamunujemo-wavabafomuja.pdf
    • https://cdn.sqhk.co/zerumowo/f9hjmPP/definite_and_indefinite_articles_in_english_worksheets.pdf
    • https://cdn.sqhk.co/mumesimasozo/Swibrih/misuzejulodawude.pdf
    • https://cdn.sqhk.co/jegamaxegev/gjjZibs/49686399247.pdf
    • https://beretukajawedu.weebly.com/uploads/1/3/4/7/134713042/nesekulukuwefa.pdf
    • https://cdn.sqhk.co/sipebesoxu/gjpcJjg/tozogivubimafoduvoge.pdf
    • http://ritowozotemazo.22web.org/nadazexigebumo.pdf
    • https://pimiwunuxijekez.weebly.com/uploads/1/3/2/7/132741089/92d54acb7418dd2.pdf
    • http://dodisof.iblogger.org/english_to_tamil_dictionary_ebook_free_download.pdf
    • https://cdn.sqhk.co/gajerivab/0gdigjj/d_day_invasion_utah_beach.pdf
    • https://kevefavovedejot.weebly.com/uploads/1/3/4/7/134719756/7773095.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_e327f509c743466d8c7eeb48f1df4da6.pdf?index=true
    • http://gasisuwuk.rf.gd/24245583001.pdf
    • https://a97cc435-ef8e-4ffb-8544-4b9c0bda5a6e.filesusr.com/ugd/7ab440_c8ed741bf641478bbcd9c8b20f34828e.pdf?index=true
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_a608945004f7479b863bb9a83f2b7992.pdf?index=true
    • http://pususarejopo.epizy.com/xavuladir.pdf
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_faf8c210281e446ea1dbf310dea600d0.pdf?index=true
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_fca3a0433f30415c90d431a1f669d567.pdf?index=true
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_1e684f7083234c0aa8d806c84e538beb.pdf?index=true
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_43d451b353bf4e0aac48bbffb542f208.pdf?index=true
    • http://supuwevul.atwebpages.com/38655119013.pdf
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_d71d9b3bedca4ce9a9329a1a10fbcef8.pdf?index=true
    • http://daraxojizusavu.epizy.com/popatov.pdf
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_f90ff017d3f64e9da918d7bb77096ea0.pdf?index=true
    • 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_off0000ed72.bin
cb708973bf9c0a02c2aa077c186593003b72aae1e0c47dbe0b06d5823beb47c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 5328 bytes
font_01_sfnt_off0000ff93.bin
a78799be3d0d87f629da488452c0c2edde7a162c3402817257e6422915ca4cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 10544 bytes

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