Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f7631e0e185323…

MALICIOUS

PDF

75.6 KB Created: 2021-01-21 00:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b6a0fabd8ff20f93ffe812a3ff0f002 SHA-1: d04e1891718eb35238769b7d6cfc14573b2b7924 SHA-256: d9f7631e0e1853233699530cea8a18a2026ad3d6a27f73f4bca3313c743fdbd7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external links point towards the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=big+ideas+math+geometry+student+journal+answer+key+chapter+6
    • https://cdn.sqhk.co/nodewanase/jchiTum/shooters_world_orlando_fl.pdf
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/3472732.pdf
    • https://pelozaxuji.weebly.com/uploads/1/3/2/6/132680784/rurevabuwojemep.pdf
    • https://gufiferufa.weebly.com/uploads/1/3/2/3/132302963/cae03369.pdf
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/9434eb92c.pdf
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/2262763.pdf
    • https://kubikogemovi.weebly.com/uploads/1/3/4/0/134095998/9096747.pdf
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f935b08c3e68.pdf
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/2109940.pdf
    • https://cdn.sqhk.co/redexisa/ev5hwHS/minecraft_new_survival_gameplay.pdf
    • https://rawaruginoninum.weebly.com/uploads/1/3/1/0/131070401/5961209.pdf
    • https://cdn.sqhk.co/pixazizaze/gjiehdA/janalodelibiziwekiwunop.pdf
    • https://goxanakevixi.weebly.com/uploads/1/3/4/8/134857001/fatokuno-pogowu.pdf
    • https://cdn.sqhk.co/pubodegosog/ggicLij/buzunojidadek.pdf
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/bfcedadb6a.pdf
    • https://cdn.sqhk.co/fabavukunatu/jh4CLUC/ebay_daily_deals_free_shipping.pdf
    • https://valutakawewa.weebly.com/uploads/1/3/1/3/131378791/999ba83bc2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fifomi/33348279784.pdf
    • https://s3.amazonaws.com/jafujasiwetid/beautiful_sea_live_wallpaper_for_android.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e783.bin
17dc30b7b99575ad9454dc0964633a667e46ebdffc12c0ec3c0492f7fd66c6fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 6024 bytes
font_01_sfnt_off0000fbff.bin
92b27a76e5b1318e93f474092587a00276c23a395486a1236e27f1e9bf9d549b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 10816 bytes

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