Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63d41b7e819bc92…

MALICIOUS

PDF

79.3 KB Created: 2021-02-08 21:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ab747134cef900e6f5b1d8883016425a SHA-1: 367d812d4cce9d9586ee6fbba7195bee428d6df8 SHA-256: d63d41b7e819bc92ff7770a26bc4dd24414de3e2337c2e2a12499985a8ca677b
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, contains text related to "Mathe binomische formeln einfach erkl r t", suggesting a lure. Numerous external URLs are embedded, many pointing to disposable hosting, indicating a link farm or phishing attempt. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution vector.

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://bologen.ru/wb?keyword=mathe%20binomische%20formeln%20einfach%20erkl%C3%A4rt PDF link annotation
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/4875685.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5fe3800c1bf81.pdfIn PDF document text
    • http://itash.space/automatic_car_wash_business_plannc7b5.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/gDMqjew/megan_rapinoe_book_target.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/xikodugatususa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_600fbc540b310.pdfIn PDF document text
    • http://klokisik.space/singh_is_bling_songs_mr_jatt1r0kq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455669/normal_6006e2866dab5.pdfIn PDF document text
    • http://soldonlakewood.com/ninja_air_fryer_oven_xl9cxzf.pdfIn PDF document text
    • https://marutonekuposew.weebly.com/uploads/1/3/1/6/131606360/fixesenugakura.pdfIn PDF document text
    • https://vixalabalu.weebly.com/uploads/1/3/4/3/134396729/vebiresinafumagur.pdfIn PDF document text
    • http://bonifacy.site/bovogejagijef3zump.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372983/normal_5fe43ecd75049.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392444/normal_5ffb228858241.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rozebofukixus/adobe_photoshop_free_windows_7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 5352 bytes
SHA-256: 42f92f16a317c793e8c02b1829fe3401f4e35cb517587311104defe9b2a3f6dd
font_01_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 11184 bytes
SHA-256: 3d9c7d0b347e450c8af26cbfeb81e0659a4242159059fe8a32e0ffddac4cd6d0
font_02_sfnt_off00011f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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