Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbddb9cea7b7a93…

MALICIOUS

PDF

83.9 KB Created: 2021-03-18 22:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fb6cbafe3ddf66377d9da47c6dab0a4 SHA-1: b5dc56b04cfd439a033961e668cd122821e582b6 SHA-256: 2cbddb9cea7b7a9361acc7c6057ebccf84087685431d2875ade31b5f1a305538
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/award?keyword=importancia+de+beber+agua+pdf
    • https://cdn-cms.f-static.net/uploads/4474169/normal_602a0b0a3bd91.pdf
    • http://sesizuxewewax.mygamesonline.org/zudeti.pdf
    • https://static.s123-cdn-static.com/uploads/4366980/normal_5fe19900f3320.pdf
    • https://static.s123-cdn-static.com/uploads/4383568/normal_5fffc4c127ce8.pdf
    • https://static.s123-cdn-static.com/uploads/4450438/normal_5fff0be53439c.pdf
    • https://cdn-cms.f-static.net/uploads/4450034/normal_603e385c698f2.pdf
    • https://kerozusokenizil.weebly.com/uploads/1/3/1/3/131383247/zifafagexot_lenev.pdf
    • https://vekowafonomi.weebly.com/uploads/1/3/4/6/134692424/wizibajivizo-doparepot-sizagidunesux-meligitale.pdf
    • https://static.s123-cdn-static.com/uploads/4450427/normal_5ff1cdfca0e74.pdf
    • https://cdn-cms.f-static.net/uploads/4412584/normal_5fd6745a5b0da.pdf
    • https://static.s123-cdn-static.com/uploads/4428043/normal_5fec5b8f046e2.pdf
    • http://nebofonuve.mywebcommunity.org/51005231028.pdf
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5fe7838bea855.pdf
    • https://cdn-cms.f-static.net/uploads/4374853/normal_6013bab516e2e.pdf
    • https://jorojiwelipevo.weebly.com/uploads/1/3/5/3/135393556/ranezo-vigazav-bigaxorutu-wekole.pdf
    • https://static.s123-cdn-static.com/uploads/4408864/normal_5fddb222dbcdc.pdf
    • https://puxezemugip.weebly.com/uploads/1/3/4/3/134311794/804266.pdf
    • https://gaxurorilapuw.weebly.com/uploads/1/3/2/3/132302857/kotuxegatod-jiladopa-xugimidodokam-neliwifibexe.pdf
    • http://mosuxuvemuzuwex.mywebcommunity.org/40465557192.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vagoposejexuma.epizy.com/highlight_in_kindle_app_on_ipad.pdf
    • http://dezazikep.epizy.com/letter_format_for_college_library.pdf
    • http://devevemiwu.epizy.com/officium_beatae_mariae_virginis.pdf
    • 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_off0000f217.bin
b32347417a80c854cd75d64218606d4aa4029a78f81a743572a155f17f58e3bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 5340 bytes
font_01_sfnt_off00010427.bin
bec35e841322c344dea8194e9ddfec89bc22f1020a72c3577cab3643d1baebb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 12700 bytes
font_02_sfnt_off00012add.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADD 16204 bytes

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