Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d601e6ba803f9a…

MALICIOUS

PDF

84.6 KB Created: 2021-03-16 13:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2ff02fc84aff1ecd2753cd87364d017f SHA-1: aef4b547a3e02ca56e4ec8d23bbefca73f331782 SHA-256: 25d601e6ba803f9ae9479a9c69a53cf69bdd6135f9e56c553df60ad3a12d574d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/wix?keyword=recursos+literarios+en+don+quijote PDF link annotation
    • https://cdn.sqhk.co/koditisalupe/FharNgg/keller_williams_open_house_signs_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/gTUk2NN/zara_home_around_me.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/htggKha/ripuzenivow.pdfIn PDF document text
    • https://cdn.sqhk.co/xupotuferu/gchcjjP/all_power_generator_3250_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492880/normal_5fda46a02317e.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/pac_accessibility_checker_download.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/rowebazakej.pdfIn PDF document text
    • http://fojukivijivik.medianewsonline.com/carte_de_visite_format.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/how_to_start_reading_spider_man.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452161/normal_6005739ded94a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377128/normal_5fec25495991f.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetovukufo/gcicggb/buxumisukijiwevanerokuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_602621b0298bc.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/2005_malibu_maxx_starter_location.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/how_do_i_know_if_my_ipod_shuffle_1st_generation_is_charging.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418558/normal_5fdff1a376f9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_3de34378a15b47adbd99b25b4e478d90.pdf?index=trueIn PDF document text
    • http://gajitigigezujan.epizy.com/bissell_pet_pro_plus_instructions.pdfIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_5b88ad33249b4ec2850fa688fca97873.pdf?index=trueIn PDF document text
    • http://vobewegogiz.rf.gd/credit_risk_rbi_guidelines.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_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 5144 bytes
SHA-256: 95e0a74cb714377565fc0cef26ed3b47641b8695d32f29b0b357b0f968aa69c5
font_01_sfnt_off00011ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 11900 bytes
SHA-256: 88ca50414bc74df52eed99a27ca4ad764c2903d15a85194c6c9731b373b327d4