Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6c20366e7b7d54…

MALICIOUS

PDF

70.6 KB Created: 2021-03-25 02:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 57461b48db7be76b6c45656ce3c29d36 SHA-1: bbb163f9796bde1b11fad7f62c7bbed4bc23361b SHA-256: 4c6c20366e7b7d54cb980d4880c8a7fb8141168153bf5bbc282d0513cf4e5404
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Steal or Modify Data T1059.007 JavaScript

This PDF document is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. The document employs an MFA/one-time-code harvesting lure, presenting itself as a Steam login verification to trick users into submitting sensitive credentials. The presence of numerous external URIs, many hosted on disposable domains, further supports its role as a phishing or credential harvesting tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://xezojetit.ru/123?utm_term=steam+verifying+login+information+stuck PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427499/normal_6001805a315c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529697/normal_6031344d396b3.pdfIn PDF document text
    • https://sonikimejikelo.weebly.com/uploads/1/3/2/6/132681145/4448915.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/gugudajc5y21.pdfIn PDF document text
    • http://naturka.space/what_marvel_movies_are_on_netflix_usak1ii4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422368/normal_604203e60ccff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487187/normal_6022e0d01a7a9.pdfIn PDF document text
    • https://cdn.sqhk.co/zonejonono/jewgejj/zuxodudowebuxux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460477/normal_5fd2f32ff3e69.pdfIn PDF document text
    • http://simkosa.website/free_piano_sheet_music_easy_christmas_songs1dl2x.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/memabofilojufi9jvpx.pdfIn PDF document text
    • http://devojesan.iblogger.org/11514130535.pdfIn PDF document text
    • https://cdn.sqhk.co/nebinefis/grhazha/jegop.pdfIn PDF document text
    • https://cdn.sqhk.co/nakizenonetu/jthaJjj/bass_booster_equalizer_bluetooth_headphones_apk.pdfIn PDF document text
    • http://magazinrf.xyz/rainwing_wings_of_fire61mjf.pdfIn PDF document text
    • https://cdn.sqhk.co/siganewita/eiePNiQ/fojowabiva.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/gfCK0ii/outdoor_basketball_court_at_night.pdfIn PDF document text
    • https://nugatifijomit.weebly.com/uploads/1/3/4/7/134715362/27847b7eeb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_07b57edf97994907b1e82f9b7f86035c.pdf?index=trueIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_b78992dddbbc4983987816164717632a.pdf?index=trueIn PDF document text
    • http://jatuxijor.epizy.com/kanye_west_runaway_piano_sheet.pdfIn PDF document text
    • https://a181bb3e-7445-4f1f-a1cf-b2fe66c13e92.filesusr.com/ugd/91ce54_e62c525561d5472c8b7d953464629e2b.pdf?index=trueIn 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_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 5528 bytes
SHA-256: 0d029378ede664722b0556bc7b62d34b68f53e386b3239c04704812a55bc4520
font_01_sfnt_off0000e8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 10660 bytes
SHA-256: 01ed02b2423a83d4cde117380f227e49c243bcd3c56f86db00310807ef5002b0

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