Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6eed1f4439bd08…

MALICIOUS

PDF

81.2 KB Created: 2021-05-16 22:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 841946e2f99d3f6af0894d0cf884a16c SHA-1: 2634b5910868712a65da003d60dd66b174aeef93 SHA-256: 8f6eed1f4439bd08aafb0d81d02e77abd94250387616215c2cbe947845ec7f49
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

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://dugedepap.ru/strik?utm_term=calligraphy+lettering+styles PDF link annotation
    • https://xijananok.weebly.com/uploads/1/3/0/7/130740199/mutejunol-wakako.pdfIn PDF document text
    • https://pudefita.weebly.com/uploads/1/3/4/4/134476078/aa01fd.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/hdhhMhd/fox_sports_go_login_roku.pdfIn PDF document text
    • https://fanuwatesovize.weebly.com/uploads/1/3/1/3/131380837/277803.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/fii4xgg/pegasusa.pdfIn PDF document text
    • https://cdn.sqhk.co/jopuromug/ieigjbi/ludo_game_ludo_2020_star_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jorubili/ghcwSgg/moponabufupesefiv.pdfIn PDF document text
    • https://zigibopujomez.weebly.com/uploads/1/3/5/3/135350997/3490067.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/forefixibuvepupaso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://farapatenaru.rf.gd/anonymity_on_the_internet.pdfIn PDF document text
    • http://kurerori.myartsonline.com/17012535313.pdfIn PDF document text
    • http://kivaxabobusited.epizy.com/multicast_routing_protocols.pdfIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_4a0bcfb555d04711b2d96daa27ebd62a.pdf?index=trueIn PDF document text
    • http://miwirunutepebol.epizy.com/punctuation_worksheets_for_grade_4.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_2ae8fcc31298483780f36488ac09449e.pdf?index=trueIn PDF document text
    • http://nafusenij.rf.gd/what_is_a_wake_when_someone_dies.pdfIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_4a1b37cde1a84110a18efcc11a4242b3.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_d7d39b389c744f838c6f2f5281f14d08.pdf?index=trueIn PDF document text
    • http://nisifibuvez.epizy.com/27534760364.pdfIn PDF document text
    • http://zixapesuj.rf.gd/timber_tuff_benchtop_electric_chainsaw_chain_sharpener_cs-bwm.pdfIn PDF document text
    • http://pafisepobisu.rf.gd/tecnologia_de_alimentos_definicion.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_92c118fb9693471eb84de3dcc76e2588.pdf?index=trueIn PDF document text
    • http://difugarulid.epizy.com/manual_lawn_aerators_uk.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_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 5088 bytes
SHA-256: a8debb71625f0686168e19122c82233d351a33fa727717bae0dd3beab1b0e0df
font_01_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 10416 bytes
SHA-256: d68cab35854d12c7116a2fee88456e246599354aa8ef53ddd476c8d879ad1414