Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddc3a88e6fe0992…

MALICIOUS

PDF

70.0 KB Created: 2021-02-13 01:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f93f890c8fa8cd7869827525c2d4b6b3 SHA-1: 1e2b4a6a60fab88737421cc1f64db3bc815c7dd1 SHA-256: 5ddc3a88e6fe09920f525646126f0846d426f3183583d4dcc3e5ec921fac814d
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as document titles, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://maypoin.ru/123?utm_term=revenge+of+the+sith+poster+hd PDF link annotation
    • https://cdn.sqhk.co/ritasuxa/nWgetjd/basketball_battle_shots.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/hhdgg7p/timekovadozeweka.pdfIn PDF document text
    • https://cdn.sqhk.co/kupemopo/Aiahjif/free_fall_calculator_with_mass.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/kuzetuzame/1jcYyhj/bingo_tv_show_tickets.pdfIn PDF document text
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/461a7e1b9d.pdfIn PDF document text
    • http://potaberukogox.66ghz.com/12106716027.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/ifibyhb/conspiracy_theory_mel_gibson_netflix.pdfIn PDF document text
    • https://xadixifiv.weebly.com/uploads/1/3/4/8/134888816/c4df17be927.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/Y4PM3QU/vitamin_c_powder_drink.pdfIn PDF document text
    • https://cdn.sqhk.co/guposidum/d9gcoMP/bubizowasizivetow.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/hajfxgi/super_dragon_battle.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/dRjj1ih/85022879951.pdfIn PDF document text
    • https://cdn.sqhk.co/pategIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapetevik.epizy.com/osha_accident_report_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/kopotewidunogekitesir.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/partnership_deed_registration_format.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/20027620650.pdfIn PDF document text
    • http://zupotid.epizy.com/56724910758.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/blackmail_1973_all_song.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/2019_fantasy_football_draft_day_cheat_sheet.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_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 5128 bytes
SHA-256: da5c9b643e51adb4bdf82bcceb0656cd7af4068b3da0b9ba212acd4b150a6887
font_01_sfnt_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 11024 bytes
SHA-256: 1a58b40e53e756baadc17b7f5744c06dc21c2241a8d7d0c09b32ac54b45d8d6c

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