Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f52391b7f407ae4…

MALICIOUS

PDF

82.5 KB Created: 2021-04-01 11:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89098788d7e14ca6a9b00f605150cdb3 SHA-1: 661b9ffc7cb4405a57405b8bf7d297847f350674 SHA-256: 7f52391b7f407ae49372f09d70a39c8393352b690a1a97bbee1f955aae363429
136 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV signature and an ML classifier, indicating a phishing or trojanized PDF. The presence of an external URI pointing to 'botokaw.ru' suggests a redirection to a malicious site. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates suspicious command-line related tokens within the document, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://botokaw.ru/strik?utm_term=can+you+split+aces+in+blackjack
    • http://tadurarawi.mypressonline.com/berlin_lonely_planet_download.pdf
    • https://static.s123-cdn-static.com/uploads/4385612/normal_5fecc3a6374de.pdf
    • https://static.s123-cdn-static.com/uploads/4482849/normal_5fc73bc29e3d8.pdf
    • http://fomigiv.mypressonline.com/51661977216.pdf
    • http://nuxaxupijejuz.iblogger.org/differential_calculus_sample_problems_and_solutions.pdf
    • http://waliwosodumobu.iblogger.org/17112041165.pdf
    • http://gefosezidubajoz.scienceontheweb.net/cdf_and_calculator.pdf
    • https://static.s123-cdn-static.com/uploads/4385612/n
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://barodifa.rf.gd/76922314788.pdf
    • http://gosaduzunake.myartsonline.com/commercial_kitchen_hood_fire_suppression_systems_cost.pdf
    • http://wovibojo.onlinewebshop.net/role_of_antioxidants_in_cancer_treatment.pdf
    • http://sogurorirerew.onlinewebshop.net/maus_parte_1_espaol.pdf
    • http://mojogoralil.onlinewebshop.net/42049295474.pdf
    • https://uploads.strikinglycdn.com/files/44cbab4b-55f5-4eab-814b-4795169cce11/how_to_list_the_files_in_cmd.pdf
    • https://uploads.strikinglycdn.com/files/76fc2722-976e-4647-a13a-700420c6c0ac/39927474312.pdf
    • https://uploads.strikinglycdn.com/files/29a42b3a-c3da-40e8-bad6-af2d17bf6e91/57009090345.pdf
    • https://uploads.strikinglycdn.com/files/9bef18e2-e43e-485f-a8b2-c08ad168c0d0/xedeziwodu.pdf
    • http://jokosen.atwebpages.com/what_is_the_best_water_cooler_dispenser_to_buy.pdf
    • https://uploads.strikinglycdn.com/files/ef0c7046-c6d4-48bc-8886-a9d1f9eda6d5/limirowog.pdf
    • https://uploads.strikinglycdn.com/files/7e6e9295-180f-4198-9439-f3541d298a76/desktop_means_in_english.pdf
    • https://uploads.strikinglycdn.com/files/c63b0d2b-ca9b-430a-a8b5-a33c13a14b2c/27319535791.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_off0001054f.bin
2dc10b318d36ec8cfbcb0cbc23b32dddbb5e8322672f17424ac1053ce3c93f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 5120 bytes
font_01_sfnt_off000116d9.bin
91ce5860e3b67abb766980df4feb43310454c3fc00cfc56c44c0e60997da70a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 11128 bytes

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