Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e4ce02cf398bee…

MALICIOUS

PDF

70.5 KB Created: 2021-03-07 04:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9591023441ac5b33ca11819d8de934bc SHA-1: 2d3e93d555322710cbee4e9b89698884dad3c038 SHA-256: 19e4ce02cf398bee22dea377d3607098323076d7076b50aa76b4b657ffc897fe
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external links, many of which appear to be SEO-optimized for search engines. One prominent URL, 'https://midufefew.ru/wix?keyword=manual+ademco+vista+48', suggests a lure to download content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://midufefew.ru/wix?keyword=manual+ademco+vista+48
    • https://cdn-cms.f-static.net/uploads/4460076/normal_600d40f9a9dad.pdf
    • https://zebonusifok.weebly.com/uploads/1/3/4/5/134509505/bened.pdf
    • https://cdn-cms.f-static.net/uploads/4458145/normal_601145387e589.pdf
    • https://cdn-cms.f-static.net/uploads/4456999/normal_60117fc869313.pdf
    • https://cdn-cms.f-static.net/uploads/4426690/normal_6029b558e80f8.pdf
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5fd7e61caaa7a.pdf
    • http://penoligis.22web.org/show_me_the_wow_computer_for_seniors.pdf
    • https://danodukuwen.weebly.com/uploads/1/3/1/6/131637043/2589413.pdf
    • https://cdn-cms.f-static.net/uploads/4447096/normal_602b4cb05685e.pdf
    • https://vebavorosufate.weebly.com/uploads/1/3/4/7/134742301/7387919.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e5318012-245f-420c-bb17-93d098adaf89/tunamukalomizapagovukimo.pdf
    • https://s3.amazonaws.com/vabemavuputenif/97817382387.pdf
    • http://xaposekesudonod.epizy.com/gosowerefirazevo.pdf
    • https://s3.amazonaws.com/jazofi/wagutiwirubitowut.pdf
    • https://s3.amazonaws.com/vutame/kexazamebi.pdf
    • http://nitusubor.rf.gd/smok_devilkin_user_guide.pdf
    • https://uploads.strikinglycdn.com/files/bf9def03-8ea1-4f18-bcca-b406de7607af/1735622520.pdf
    • http://gixosuwali.rf.gd/aeroflot_russian_airlines_flight_information.pdf
    • http://zetiguseje.rf.gd/tosedesigevukitadog.pdf
    • https://s3.amazonaws.com/polexebuj/yowhatsapp_v8._0.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9e7.bin
013109178f7e1fdb419373003579dee9cf530a282836759d25c9b262014ad8f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 5220 bytes
font_01_sfnt_off0000db9c.bin
1e46c56684372266f35986e65c68e10429efb80262cf8005287a97877711fa87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 10344 bytes
font_02_sfnt_off0000fed9.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 4324 bytes

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