Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d5692834f812ad…

MALICIOUS

PDF

74.0 KB Created: 2021-03-21 06:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 05b986087145bd0ccd550d0e39e95818 SHA-1: 4668f6f6aa943edc0fb4e4dbfd80a75e2abb902d SHA-256: 26d5692834f812ada272ffd8537afeadf337b6b9861e2b26646dfe26baa1087f
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URIs, with a primary URL pointing to a suspicious domain. The document's structure and content suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://resalured.ru/strik?utm_term=dizionario+italiano+inglese+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501029/normal_60534afb65cae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366668/normal_5fff09c277bcb.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/eAMjfhc/39145830466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488329/normal_5fdc26637af33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_601863809d3d1.pdfIn PDF document text
    • http://vuzosemeve.22web.org/pekugijibi.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/ggjakja/download_mods_for_minecraft_guns.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401982/normal_600ac7ae42d85.pdfIn PDF document text
    • http://xufuxenu.mypressonline.com/asturias_piano_notes.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/the_hunger_games_2012_full_movie_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/wibggIA/free_music_download_unblocked_at_school.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/cadac437-dc4f-44f4-9180-d43cd8c809a2/96743989807.pdfIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_b9949be0f02a4ec282e902bd9c3ad8ef.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_fbe49e5f4b7a40fcae196425ddc70334.pdf?index=trueIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_496b3ff2adac47208958bf6ebe9991f0.pdf?index=trueIn PDF document text
    • http://mivuwujat.rf.gd/raladusasapakaguwikevevo.pdfIn PDF document text
    • http://vuruwabudakase.epizy.com/chiang_kai_shek_college_uniform.pdfIn PDF document text
    • http://bikujupopas.rf.gd/samsonite_cabin_luggage_with_laptop_compartment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3c9ee4-e818-46c8-b61a-3788349ea353/warriors_sunrise_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5f720e-5d06-40a2-bf3d-532397d00171/how_does_a_flush_work_in_cribbage.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_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 5256 bytes
SHA-256: 17077e73312636095f04c0d53da5edb6e74ffcabdc657ff4215b5d0c65fb315d
font_01_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 11400 bytes
SHA-256: 67c63dbeb110f269e83e959c943a54768775540d607b72b7c3d91b6dc27f0c6f