Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3420a4b6768096…

MALICIOUS

PDF

68.0 KB Created: 2021-02-19 10:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 545790b1ea2f6bd5ae321bdfc570c6ba SHA-1: 27380af7454c5f26fa3df0872ed19db2e3a8bd9b SHA-256: bf3420a4b676809695e1c74c06b0aea501eb464ec8fdb19947d555a19e2c49fc
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm or a phishing campaign designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=singer+model+237m-a PDF link annotation
    • http://rubeatyshop.xyz/nuxatudozodavububavijuqmz6.pdfIn PDF document text
    • http://7evenrp.ru/57825497942m7yrk.pdfIn PDF document text
    • https://juvinegedixipa.weebly.com/uploads/1/3/1/6/131637649/logemowis.pdfIn PDF document text
    • https://kukonugaxa.weebly.com/uploads/1/3/5/3/135327287/damonasasukufuf_fevuxofop_jidizabenik.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/bEjgCIo/transference_game_ending_explained.pdfIn PDF document text
    • https://cdn.sqhk.co/tajugajobib/ggGgfQ3/sabidajomi.pdfIn PDF document text
    • http://brandframeb.com/9285894114690wg5.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/if3hh6L/kogifege.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/hhgicRc/followers_gained_artinya.pdfIn PDF document text
    • http://metazoaapc.fun/bombay_movie_hd_video_songs_freed5ed8.pdfIn PDF document text
    • https://cdn.sqhk.co/xoresarib/B6XHgi2/uncertain_definition_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/O1jfje8/brain_dots_solution_294.pdfIn PDF document text
    • https://loseseseveru.weebly.com/uploads/1/3/0/8/130813975/3495133.pdfIn PDF document text
    • http://xxlmature.site/18949353311cdju.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/bjcgfib/shark_mod_minecraft_1._7._10.pdfIn PDF document text
    • https://cdn.sqhk.co/kixikeli/ngdvQ7k/xudazuwesirerasijiguj.pdfIn PDF document text
    • https://rowagikej.weebly.com/uploads/1/3/4/6/134678960/malofumem.pdfIn PDF document text
    • http://digitalmedialit.com/misasufiwejekeforocbju7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC33 5480 bytes
SHA-256: 3495e776a7953e4abb8dc5332d41501fe832aadf0f332ab700096b2e9d603de8
font_01_sfnt_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 10732 bytes
SHA-256: ff1a341c779cafcdb8345c7f4c2e3a71c0523793679dffec20b2f8034a2abd83

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