Malicious PDF — malware analysis report

Static analysis result for SHA-256 790382571d5af91f…

MALICIOUS

PDF

84.1 KB Created: 2021-03-15 01:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d9b2c753987ef333d30868669cd3625f SHA-1: e122682c1634a4e3a6f8060b19011fd74a6178e3 SHA-256: 790382571d5af91f0a4e5b3bf4466eb161ee74d4bd7bf579e411a6e0524a2c87
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The document body, though heavily obfuscated, suggests a lure related to 'installing a wally receiver'. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=how+to+install+a+wally+receiver PDF link annotation
    • https://cdn.sqhk.co/fesakesovoka/I2Hgigf/middletown_umc_podcast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_6019034bebd26.pdfIn PDF document text
    • https://debozapo.weebly.com/uploads/1/3/1/1/131164198/36180a249da312.pdfIn PDF document text
    • https://cdn.sqhk.co/bivosemubo/gicjige/xumojabivibawuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_604332753aae3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372361/normal_5fe492c4d9d60.pdfIn PDF document text
    • http://mx50off.info/how_long_to_store_lettuce_seedsueqt9.pdfIn PDF document text
    • https://daxodewime.weebly.com/uploads/1/3/1/3/131398188/e5377881.pdfIn PDF document text
    • https://lotaximadezepa.weebly.com/uploads/1/3/1/3/131379514/9232133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_5fd3dd67a8fed.pdfIn PDF document text
    • http://bigops.fun/chinese_dragon_craft_preschool50vqm.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/jjgejig/rorixabofa.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/L4jcvb9/banizogananaj.pdfIn PDF document text
    • http://cloudplay.xyz/156502670326go6v.pdfIn PDF document text
    • http://stebsmeh.space/fatuxegezpcws.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_6024f49c8c2bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471995/normal_60393490e8ff4.pdfIn PDF document text
    • http://graatorama.fun/john_deere_345_lawn_tractor_parts_diagram4rs0m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_5fdb0c3281f4d.pdfIn PDF document text
    • http://banquepopulaire-fr.org/emerson_tv_owners_manualsya36.pdfIn PDF document text
    • https://jenitexul.weebly.com/uploads/1/3/4/8/134859983/boganibitatenezelela.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/ZMjceIu/81565994618.pdfIn PDF document text
    • http://migriruy.ru/maytag_5000_series_washer_with_steam_manualsqkt0.pdfIn PDF document text
    • http://bluhgang.best/nazezomuraxexabekiz1f5gj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 4796 bytes
SHA-256: 2df1ff0fd6152edc2bc79f198c0783aa3c9ac88ce6ec80021afb47a72ab6e181
font_01_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 11132 bytes
SHA-256: e03a21e2d76e2509c9c810d375d3b9568cca22a90c6837753534de4db891e454
font_02_sfnt_off00013484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13484 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34