Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa852744bedfa0b…

MALICIOUS

PDF

80.7 KB Created: 2021-02-25 07:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f850451436c6f14a377abeb103804f34 SHA-1: e3c70b4862e175fef9f87c0a2e37da1da5eee1de SHA-256: baa852744bedfa0b0ae354d3ae5b3f0838f7357a354cb071cf92ed6550b11b73
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, appears to be a lure related to medical information, aiming to trick users into clicking the embedded URLs.

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://seumenha.ru/strik?utm_term=causas+de+trombosis+venosa+profunda+pdf PDF link annotation
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/2151697.pdfIn PDF document text
    • http://didazema.mypressonline.com/90762187107.pdfIn PDF document text
    • http://realnoe-obshenie.online/love_yourself_highlight_reel_piano_sheet_musicltsh6.pdfIn PDF document text
    • https://sevezumu.weebly.com/uploads/1/3/2/7/132710575/3acbb75136878af.pdfIn PDF document text
    • http://alexandreablog.com/437297372522axw6.pdfIn PDF document text
    • http://geosen.net/author_s_purpose_entertain_persuade_inform_worksheetsoie6m.pdfIn PDF document text
    • http://creditreportfast.info/flight_simulator_games_mod_apkqs9qf.pdfIn PDF document text
    • https://gukamixi.weebly.com/uploads/1/3/4/0/134042495/4ed84c0fe.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/poulan_chainsaw_18_chain_replacement7btr9.pdfIn PDF document text
    • http://de-bewertung-889562.icu/barrons_ap_psychology_7th_edition_p0qvn7.pdfIn PDF document text
    • http://golixudib.mypressonline.com/povoralenepiropuzomog.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/90550519528.pdfIn PDF document text
    • http://vostokzapad.su/suzanezenexitmdcw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://porilebunenagu.rf.gd/how_to_use_wahl_beard_trimmer_to_cut_hair.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/kosinikiwemulimewewal.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/sopenaziroxugifomuta.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_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 5260 bytes
SHA-256: adf368144d71fa2f0924c57b5a560298dac5ec183fb53a8bd7ef2e5fd9022d6d
font_01_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 11556 bytes
SHA-256: 09a611bb9a24e029f84eef34e24ffcd3f3ebf687bd5589ebb8d338cd09d37006

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