Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b4954a1a086f8b…

MALICIOUS

PDF

81.9 KB Created: 2021-03-20 21:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82bcf0edaad75d7cdea07398c14c0d59 SHA-1: 9d0006c78d49c07f4965e6b3bceec2dc849e615f SHA-256: 23b4954a1a086f8bc9e9f8cd06fe59fdff48138bf18df8b12f817ef222f7c55e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection strategy. The document body, though heavily obfuscated, contains text related to 'online apk installer for pc', aligning with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://zajinet.ru/wix?keyword=online+apk+installer+for+pc
    • http://copyrighthelpptteam.com/25032709261tswsa.pdf
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/kebidumexoj_jazepige_judigitoxup.pdf
    • http://hotsales-com.xyz/kefepageduvidanazafuvuombgx.pdf
    • http://raguvigawak.mypressonline.com/fuwasorasomugadufetedodin.pdf
    • http://nujijaj.getenjoyment.net/fight_club_2020_trailer.pdf
    • http://ppl-nutrshopfit.website/62727559399b7vt0.pdf
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/9867793.pdf
    • http://wawesoja.sportsontheweb.net/9362879394.pdf
    • http://madewithsunshine.com/dojomuselawuzuzo8ro08.pdf
    • https://cdn.sqhk.co/mapetidul/fzrihJy/drift_x_burn_apk_android_oyun_club.pdf
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/fawedomel_gunadi.pdf
    • https://cdn.sqhk.co/jipodipotaj/ejbfIKn/vr_home_run_derby_ps4.pdf
    • http://zagejudivavi.sportsontheweb.net/quality_assurance_and_quality_control_in_pharmaceutical_industry.pdf
    • https://sijujufe.weebly.com/uploads/1/3/4/6/134696532/nativebuwakivel.pdf
    • http://gidpopiteru.com/61308275937vka9e.pdf
    • http://bluetea.space/bowmasters_best_character_2020ke208.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_08ddf374e1eb4114bfd744518253db4b.pdf?index=true
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_736d7b057ea54deda06070c5fa64e3a8.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecda.bin
bd1df565bdbf5d90e009325532a168695ba00824a6e6ecb6fc8ec9c8a8e5ae52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 5100 bytes
font_01_sfnt_off0000fe47.bin
7992420d1f2615f4e0303c3377e7f2ada9207949bbdc95059c5df79f8493d472		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 11232 bytes
font_02_sfnt_off000124b4.bin
280c3918024cf2b90f5d5a27e5f9fac97746caf6fec07186a47e2d12ce61ef3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124B4 16252 bytes

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