Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1a1d665bc9e327…

MALICIOUS

PDF

76.3 KB Created: 2021-03-31 23:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1d032bb3497846b775f190fee2d783c SHA-1: 2703359ce5338974056b7a9847f1c58cccebaffb SHA-256: fd1a1d665bc9e327e09c8c73b22007ff2992738b39725379e53cf1702e9d9bae
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one prominently featuring a keyword search that suggests a lure for free content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links pointing to disposable hosting, reinforcing the malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9244

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/award?keyword=libro+gente+t%25C3%25B3xica+pdf+gratis
    • http://lugabev.mygamesonline.org/peg_perego_primo_viaggio_4-35_cleaning_instructions.pdf
    • http://zonizubiro.getenjoyment.net/fufanelebutubazex.pdf
    • https://cdn.sqhk.co/gazamara/ksghZhf/linkmenu_ezerai_3_etapas.pdf
    • http://zibikudupe.mywebcommunity.org/vatuvibog.pdf
    • https://pidumiwululixew.weebly.com/uploads/1/3/4/0/134095913/tilotovadim.pdf
    • http://zutatowatipo.mywebcommunity.org/ccna_security_certification_practice_exam.pdf
    • http://rotirir.mypressonline.com/bidut.pdf
    • https://cdn.sqhk.co/letinumi/dvhjhik/dowasakipakejegusora.pdf
    • https://votopugukoz.weebly.com/uploads/1/3/5/3/135315446/wulelovubogujufaku.pdf
    • http://xedijama.getenjoyment.net/hp_laserjet_pro_100_color_mfp_m175nw_replace_toner.pdf
    • http://tokepubex.getenjoyment.net/bowojipajasinigig.pdf
    • https://cdn.sqhk.co/suzagofi/cd0hiha/68613508845.pdf
    • https://cdn.sqhk.co/kevovevude/6wjhpg6/sujexefigizunipibibesuno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://litabasiker.onlinewebshop.net/siwutiwedipeliv.pdf
    • http://metiguwuwezaza.atwebpages.com/flamenco_guitar_scales.pdf
    • http://sitafefisoju.atwebpages.com/toilet_tank_not_filling_dual_flush.pdf
    • http://kadizilurojiniz.onlinewebshop.net/85416223936.pdf
    • https://uploads.strikinglycdn.com/files/48fcefc4-a2fe-4108-b9ad-80b8c5cafb38/exocytosis_definition_science.pdf
    • http://jabodegodonirad.atwebpages.com/tiger_rice_cooker_jbv-a10u_instructions.pdf
    • https://uploads.strikinglycdn.com/files/c0d1c056-7454-4dc0-85b5-e110189a5f54/zuvitibidetuloxovufemojo.pdf
    • https://uploads.strikinglycdn.com/files/81537741-f953-416f-bad7-6323f6f36609/28578373412.pdf
    • http://fetekovabu.onlinewebshop.net/pathology_report_sample.pdf
    • https://uploads.strikinglycdn.com/files/b9d211b3-e8f2-425b-914a-4e345ff531d0/nuxomif.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f669.bin
48e7b288a8702c6afde4f24883d58cf006faef0006e69ac9399b040adf22e37e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 5576 bytes
font_01_sfnt_off00010938.bin
ae9ffdc275ff094abe0ce42b241be993faa925d104c90850a59bd72b5dae3ac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 12344 bytes

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