Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03a01dc556d93f0…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 22:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6350bd88023c7671fd283a06337d07b5 SHA-1: bda3eead0d842c88d0c3f19d264f3589699f2d46 SHA-256: f03a01dc556d93f02215bf11eca2eb70a0f5522c3573efb18764a9ed2203f406
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to link farms on disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. While no scripts were explicitly extracted, the presence of embedded URIs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to malicious websites for credential harvesting or other scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=gta+5+cheat+codes+for+money+pc PDF link annotation
    • https://indiantiffin4me.com/nbloom/fckuploads/file/21159034765.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/39124528077.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/xamiweluvijopiseva.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/88362925986.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/nutexubanaw.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/napipusetowegudarir.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/dobarotogixirobosuwupem.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/radut.pdfIn PDF document text
    • http://secoinblock.com/upload/files/33397534441.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/9220957943.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/repubijisuxunufubum.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/jejifemegodutibevizusos.pdfIn PDF document text
    • https://termofriz.rs/files/94277420778.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/lamasotilet.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161425d47c6e8c---vobifirugepujowibilasa.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/51843565442.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/folefonademugakifosogugil.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/32370547171.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131697bbf688---10267404039.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/gosoxu.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/fazapolupurugopak.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/34280549647.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/rixawijobim.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/73938113733.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/worapexegijevugi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 11036 bytes
SHA-256: 259ae85d9ab40ef3625bf1ed37d37da298f0f4ea82727512f9d15e6caf4490b4
font_02_sfnt_off00011de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE7 18564 bytes
SHA-256: e5ac07cc44e9aee77c11147a349f2ef33895c5d8754eaa6be3f62e0ed382e2b3