Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d2bdaf5ef917e6…

MALICIOUS

PDF

78.7 KB Created: 2021-03-20 18:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00b84e432238d5726ac8ba2b7c9da218 SHA-1: 490c91eb1effac23a50e1e4b5c189650b3f11d82 SHA-256: 77d2bdaf5ef917e6b7e09b5054c7b4fbf41bafb2ae7bfab8030b238561b6cb7c
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to 'resalured.ru', which is highly suspicious and likely serves as a distribution point for further malicious content. The document body, though heavily obfuscated, suggests a lure related to an 'Oxford English Dictionary PDF', indicating a social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://resalured.ru/strik?utm_term=full+oxford+english+dictionary+pdf
    • http://levantemosaic.com/withings_scanwatch_price_uk2ymyy.pdf
    • http://peskomment.ru/what_are_three_kinds_of_texturesuh3yp.pdf
    • http://whitecheat.xyz/golf_5_2.0_fsi_engine_code9pqx8.pdf
    • http://takipleskazan.org/journey_to_the_west_series_2011u29oq.pdf
    • https://bojuwidus.weebly.com/uploads/1/3/4/6/134698781/xazizuw.pdf
    • http://prechambre.xyz/acordes_del_canto_el_nombre_de_jesus_es_poder3e1pa.pdf
    • http://copyrightviolationcenters.com/90180919455huaz1.pdf
    • http://mazers.fun/nascla_contractors_guide_to_business_law_and_project_management_practice_testfesen.pdf
    • https://jositaloj.weebly.com/uploads/1/3/4/0/134042718/fijapamibog_vozozumek_kakoguju_mixuzuzaz.pdf
    • http://extra-fon.ru/tizuxinomovisetijewipeodo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_2a12eeaa7504441d9fb7daeb1ae342f9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/83485ae1-7d79-41fe-8132-7c731ffaee82/zemesenelulozos.pdf
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_ff422c1efe454fe4b60d3766c5a79994.pdf?index=true
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_3a25673b07e0422a808a612484cc1096.pdf?index=true
    • http://samutusizezos.epizy.com/temuwoximigamemememobu.pdf
    • http://difezazimo.rf.gd/essential_english_grammar_rules.pdf
    • https://uploads.strikinglycdn.com/files/f9ec580b-095b-4e3d-991e-0f25fa734f87/desolivomonawoga.pdf
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_5c2964940d094b0c938fadeccf1fae93.pdf?index=true
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_bbd2d24651d94e5a8c2b7d49a1748b2d.pdf?index=true
    • http://zijupowisupol.rf.gd/godin_a6_review.pdf
    • https://uploads.strikinglycdn.com/files/6347b3ef-f8d1-4e1c-bd7a-29e176092ba9/what_is_the_best_stand_mixer_for_home_use_uk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ec.bin
06bce3ca7345f103dc22f3d874b14c9fb5b578b1db80e93232a55bb682e191e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 5544 bytes
font_01_sfnt_off000105da.bin
7625d0b8ef9c750494e247a5e19c2b53be98964c343082bed3c1c7a7deb9fa91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 11636 bytes

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