Malicious PDF — malware analysis report

Static analysis result for SHA-256 330fa0d686013157…

MALICIOUS

PDF

91.7 KB Created: 2021-03-14 15:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 45cd5a43b3805611c84258e1c7e62140 SHA-1: 5a0b0de81d6352dfba1d7050e816c976fadb69a5 SHA-256: 330fa0d686013157086c3676d2e6cd8537730c256892bda9e99cd15a7e71e0fb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic indicating it functions as a link farm on disposable hosting, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'Twilight saga' and 'wkhtmltopdf', which may serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://vilenefex.ru/strik?utm_term=twilight+saga+complete+book+set PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5fd8daa885053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_601936217ea66.pdfIn PDF document text
    • https://cdn.sqhk.co/vibejimipu/gnkoJja/captain_tsubasa_dream_team_apk_jap.pdfIn PDF document text
    • http://larebalin.mypressonline.com/zixirefusunaka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501356/normal_60002177af976.pdfIn PDF document text
    • https://cdn.sqhk.co/firokizita/ieha56e/vokazix.pdfIn PDF document text
    • http://sifasawiseziwi.iblogger.org/pa_boating_license_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/i66OPii/50594844234.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496816/normal_5fe2e93a9ca18.pdfIn PDF document text
    • https://cdn.sqhk.co/sikereri/hg8psgh/27550227422.pdfIn PDF document text
    • https://cdn.sqhk.co/famazipow/hcihtgi/horror_3d_escape_game_mays_the_maze_runner.pdfIn PDF document text
    • https://cdn.sqhk.co/soxobiwefili/Gh9Uiir/92369929075.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/zow3gcA/34810863275.pdfIn PDF document text
    • http://fafikup.scienceontheweb.net/best_financial_books_for_beginners.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/rode_videomic_pro_or_pro_plus.pdfIn PDF document text
    • http://xarapover.mygamesonline.org/autoharp_sheet_music.pdfIn PDF document text
    • http://pepirizibizedel.22web.org/nuluresizofeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_60286dce04cca.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/c2gey5N/92685036233.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dotenax.rf.gd/norton_antivirus_software_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/manual_capsule_filling_machine_standard_operating_procedure.pdfIn PDF document text
    • http://dupizorof.rf.gd/40493324358.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/delafatizuvuvivekozis.pdfIn PDF document text
    • http://lefarobi.rf.gd/89665347481.pdfIn PDF document text
    • http://nizofikunatafu.atwebpages.com/asma_articulo.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/kufefalo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/8273253643.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_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 5496 bytes
SHA-256: 601f9175efd3b5fb1ce6e9cea3191be0a90b4c6fcd9923f2bead6a02b83b6078
font_01_sfnt_off0001379b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379B 12204 bytes
SHA-256: 1f156e2ba796107a691f4b814fcd75ebb2b645f58bd616a1b847840ac0532eed

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