Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26a4368650c18cd…

MALICIOUS

PDF

68.3 KB Created: 2021-03-15 00:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69d83151be2dd8cc12df3ce9405b68ff SHA-1: d763937ebd6cb6fd85d1e234408076c4b28b38bd SHA-256: f26a4368650c18cda9f2d8d20403d69255d0a4c88c0e1bf230ae7cf6a539db2c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to numerous external websites. The PDF contains a large number of embedded URLs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-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
  • 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://ponafet.ru/wix?keyword=iglesia+cristiana+de+dios+es+el+poder
    • https://zubefexer.weebly.com/uploads/1/3/1/6/131606337/sexot.pdf
    • https://lalovetesosa.weebly.com/uploads/1/3/4/7/134728341/repodidew_robuzaz_bipatavav.pdf
    • http://badge-verification-center.com/how_to_clean_head_of_dyson_vacuumhson9.pdf
    • https://vajipexinonadol.weebly.com/uploads/1/3/4/0/134096003/ferisorilira_dalexexome_keworuwu.pdf
    • http://derifupiwa.mypressonline.com/sapidezuloragefatiwolepoz.pdf
    • https://cdn-cms.f-static.net/uploads/4382621/normal_6011374c13233.pdf
    • http://healthytrands.com/85062856138pxm66.pdf
    • https://static.s123-cdn-static.com/uploads/4387702/normal_5ff61fed069bc.pdf
    • https://cdn-cms.f-static.net/uploads/4370777/normal_6021ceffea566.pdf
    • https://berebexamoleti.weebly.com/uploads/1/3/1/3/131384136/jogegaguvak_murebawo_tigobojej.pdf
    • https://dejixujulazefe.weebly.com/uploads/1/3/4/8/134867847/rinoliloge.pdf
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/1857037.pdf
    • http://komozazene.getenjoyment.net/a_level_biology_questions.pdf
    • http://gufutaca3.xyz/all_things_are_possible_with_god_illustration2whk8.pdf
    • https://static.s123-cdn-static.com/uploads/4528780/normal_5fff15ceaaaca.pdf
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/903568fcd863.pdf
    • https://cdn.sqhk.co/rapurakoke/vCbjfis/minecraft_realms_download_world_failed.pdf
    • https://cdn.sqhk.co/gimiraxu/8chjgeI/booking_revolution_apk_pro.pdf
    • http://megahit.space/dive_log_book_templatefcfgf.pdf
    • https://jalesebexiw.weebly.com/uploads/1/3/0/7/130739560/9801213.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000c984.bin
d8b5a81fd48a7c158c59fd745dac27e8193a9485653c540adb7396620f244e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC984 5180 bytes
font_01_sfnt_off0000db36.bin
d7509174484e6b52dcdc3be0b97bf165634994baa4c69e947375f163e7324a0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 11992 bytes

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