Malicious PDF — malware analysis report

Static analysis result for SHA-256 6454d13ec7a36684…

MALICIOUS

PDF

78.9 KB Created: 2021-04-08 03:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b4ee131efa8aee63bf47e94d6420f49f SHA-1: 6b75db1c643e8c79ce3858f1d89788c39994364f SHA-256: 6454d13ec7a36684055b348f76164101d9669d70c304bdcaf51402595cfc074e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm or phishing attempt. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to malicious sites, likely as part of a phishing campaign or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=supernatural+graham+hancock+audible PDF link annotation
    • http://warewakeb.sportsontheweb.net/diferencia_entre_la_comunicacion_de_animales_y_humanos.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/Fdiiehf/cheat_zombie_frontier_4.pdfIn PDF document text
    • http://nuxuzuruguli.mypressonline.com/bobufese.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/8yfksP3/las_vegas_fun_bus_nightclub_tour.pdfIn PDF document text
    • http://wesused.22web.org/how_to_sign_up_for_salvation_army_angel_tree_dallas_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/w2jdjdu/throwing_knife_near_me.pdfIn PDF document text
    • http://fikebek.sportsontheweb.net/lofupuwenazekutejup.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/marla_maples_age.pdfIn PDF document text
    • http://vutisonoj.sportsontheweb.net/tecnica_de_paracentesis_abdominis.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/xijovukefawi.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/29046431428.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/daca322b-2c2c-4154-9ecd-bdbffe5522b7/msi_h81m-p33_usb_3.0_driver.pdfIn PDF document text
    • http://widusop.atwebpages.com/21453924732.pdfIn PDF document text
    • http://zenakezogutomu.onlinewebshop.net/cual_es_la_linea_imaginaria_que_atraviesa_el_ecuador.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/ejercicios_composicion_centesimal_3o_eso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9461740-6fd8-4c90-a9a8-d796880c43e6/zojinumufijivugofat.pdfIn PDF document text
    • http://virunapiwo.epizy.com/ganpati_atharvashirsha_lyrics.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/behavioral_finance_lecture_notes.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_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 5616 bytes
SHA-256: 55454e646c4b1a138b9ebd030faebdd7b5896f94bb147738f019752adf5a49fd
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 10812 bytes
SHA-256: 288358f606d0a0ff8bdbaf0d00beb53f6399a2b565a30cbb479cd830a2dc44a7

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