Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4d6b66424a6b61…

MALICIOUS

PDF

112.8 KB Created: 2021-02-27 02:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6fe455953fd246f49510a54ae9090d70 SHA-1: 3d30b56652960fa94fd2d1e187ae762590d64742 SHA-256: fa4d6b66424a6b61483094ca5ccb768bcc977a11be4fe1da3b2681f1452960a6
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains a search query related to "new moon twilight" and references wkhtmltopdf, indicating it's likely a lure to direct users to malicious external sites.

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/award?keyword=what+is+after+new+moon+twilight PDF link annotation
    • https://cdn.sqhk.co/kosifodalab/ghdsmLY/electric_heater_energy_cost_calculator.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/sojuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5fe9c9e623c56.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/hoover_floormate_spinscrub_replacement_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/tiaggjI/wemodinajumelo.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/practice_math_word_problems_for_2nd_graders.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/riwisinunepivom.pdfIn PDF document text
    • https://lovivusopeme.weebly.com/uploads/1/3/6/0/136095788/pukamituxiv-befeva-xowofaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5fee98073231d.pdfIn PDF document text
    • https://runidodejifam.weebly.com/uploads/1/3/4/0/134040950/kezezipexosixol.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/3d1319dc707.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/91632846224.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/casio_g_shock_multiband_6_tough_solar_price.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/the_scarlet_letter_chapter_16_summary_shmoop.pdfIn PDF document text
    • https://lekemevegov.weebly.com/uploads/1/3/1/4/131410090/1bea78928f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401972/normal_5fc7d516a47e3.pdfIn PDF document text
    • https://salofapaj.weebly.com/uploads/1/3/4/3/134314320/43c6af2df.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/post_civil_war_reconstruction_period.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/what_religion_is_judaism_based_on.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://megigezorozo.atwebpages.com/2002_ford_explorer_repair_manual_free.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_off0001781f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1781F 5284 bytes
SHA-256: 98f18b2894e9cfd1ab5cbd121ff4030a2d9f6862dfdc39737591a131c69bb3ba
font_01_sfnt_off00018a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A0D 13688 bytes
SHA-256: f4f5d2b80eecdb2258d7018697c630710fd0c6855bf74232fb1534f40b90ad84

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