Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc94dbabb033d6a…

MALICIOUS

PDF

74.1 KB Created: 2021-02-25 19:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8c3153de1a2c0f3d0459c9b18354457d SHA-1: 97542db2dcadc0fdfd6463b2b748cdef71400207 SHA-256: fcc94dbabb033d6aea186f6569d9b922f59a9adcab0115df4d19755a9117c7e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=computer+science+bachelor+degree+requirements PDF link annotation
    • https://nigomiboxamu.weebly.com/uploads/1/3/1/1/131163879/wutasi-rofiwakif-pusim-leruxanexat.pdfIn PDF document text
    • https://rirofogarerena.weebly.com/uploads/1/3/0/7/130775169/3b062ebdde1b45.pdfIn PDF document text
    • http://lavorunolutoga.22web.org/snake_pass_pc_game_free.pdfIn PDF document text
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/314a1f88202.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/pObidIM/rabigotijebajazeme.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/71473231858.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/gc8ija8/mobile_legends_idle_codes.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/what_size_tires_are_on_a_2005_chevy_equinox.pdfIn PDF document text
    • http://lastasked.com/supemiwfer6.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/26540897689.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/spider_solitaire_2_suits_free.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/bradford_white_gas_water_heater_service_manual.pdfIn PDF document text
    • http://voruluju.epizy.com/vuzadofikile.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/darovowutiletoju.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_off0000e46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46E 5656 bytes
SHA-256: 61cd585f81e55fcc5981969f0708246b6a238331ccc78677b6e72d59ff05bf2f
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 10652 bytes
SHA-256: cc115a3f529845d00db079e47c965fb2c77a0c27ee72b2bf5595bf06b3e57879

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