Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da99f1003606c8b…

MALICIOUS

PDF

82.2 KB Created: 2021-03-09 10:49:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4b37443233bac2a7e84d7b8c980ed742 SHA-1: 99c8a155a30bad84c62e082c65eddd498e239526 SHA-256: 6da99f1003606c8b6709805fad0f242daa399d9e8c2546f8659c9625347dff23
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. The presence of external URIs and the structure of the PDF suggest it's designed to redirect users to other malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/aws?utm_term=city+of+bones+age+rating PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418984/normal_6012f911e21ce.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/iaKviiW/nufudogab.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/1vb7fNr/vozukasanozuzozazubu.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/what_degree_needed_for_business_analyst.pdfIn PDF document text
    • http://tujubafi.getenjoyment.net/66698082497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_60301993ab006.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/jj6OFbq/dufonemurosepefatebobamav.pdfIn PDF document text
    • https://kawuzuke.weebly.com/uploads/1/3/1/6/131606938/rafedu-bilidoz-pumuvamirin-wijovezo.pdfIn PDF document text
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/xodevazevapafal-tabemibulave-vizirinovif-jesikuxomonuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_6009667b956fb.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/royal_navy_slang_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/qMiap6f/abc_radio_movie_reviews.pdfIn PDF document text
    • https://kekoluborefox.weebly.com/uploads/1/3/5/3/135327445/bb794228a3.pdfIn PDF document text
    • https://cdn.sqhk.co/gefewivurov/jjebjdt/wish_ad_memes.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/Kjijdid/bipevawawabokuwamedamil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416786/normal_60359c91d925b.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/how_to_set_alarm_on_panasonic_cordless_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/ijEjb9b/viworojabiwizopar.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/sififed-redob-vikixawu-zegojaguro.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/4c5d9864-dfaa-4aad-9fbd-30567cee21ec/how_to_assemble_a_karcher_k4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be68fc7-60bc-4c6e-ad9b-695fa9c6b36d/midland_gxt_1050_frequency_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2625d626-2419-48d1-9d9a-ec14e65cfb58/jugitalinubaguxuzuj.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_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 5052 bytes
SHA-256: 858b16f3bc498f4ef3ed16877f52c2fc25ef38ee6c0adc22e1239ea65c1a9f34
font_01_sfnt_off0001162b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162B 10804 bytes
SHA-256: 5010fc40322b5134eba892629b7a4fddf6281b3ed59c70772541a9743e7f61e9