Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea4895a496260ab…

MALICIOUS

PDF

85.9 KB Created: 2021-04-04 21:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5801adb5617b83f5a71bef631956a71a SHA-1: 6f4920c55947ca8204dfe575a442c97788524b92 SHA-256: 5ea4895a496260abbfd5a67506cb90a098ea4e32514fb6518b3f14a16c771c7e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The document body is heavily obfuscated, but the presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the primary purpose is to redirect users to potentially malicious or unwanted websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://gimoguvi.ru/award?keyword=cursive+alphabet+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/lapefuxolu/jGhf3YJ/elevation_angle_measurement_app.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/65783755297z1ss.pdfIn PDF document text
    • http://batmbatm.ru/lurolununo4gidd.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojonujaj/a8hgogi/17279173664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482020/normal_603c1e63f1db9.pdfIn PDF document text
    • http://about-central.com/dr_aidin_salih_gerek_tp3zk0v.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/iije8jb/2567918417.pdfIn PDF document text
    • http://barbanapoli.moscow/kifuwemurajetibopower1r7ws.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/ihid9RJ/how_to_draw_cartoon_characters_in_procreate_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_5fcf46df4ed2c.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/qjgcS42/dragon_warrior_3_chance_spell.pdfIn PDF document text
    • http://profmaster74.ru/mejeliwopotikufopoj7or8l.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/lhjOJii/global_warming_facts_for_kids.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_8489094f6bf74002ae9c759685fcafb2.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_de5ea93d0d4349ed8f0ac23364c3d402.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_6b05ce492c7c40cbaffc99caf15c2145.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_258fc683b0b9411490433b2e7be9c711.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_f4ac9d61e2584079918896aae672d541.pdf?index=trueIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_5bbd85c71d78472c8bc8c3a2abf82743.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_74289e6a2b5c428fa051265c4d6e4f05.pdf?index=trueIn 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_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 5388 bytes
SHA-256: 61d8501e24396ad78647bded6cb5a2d5be632803cbe824665284e621d9df55c7
font_01_sfnt_off00011926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11926 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 11332 bytes
SHA-256: a2c131ad5a4b5922990932ffee4d9ecbe2113b788d91c6ffa81df3924491d1e9