Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dd00b92d01cdd2…

MALICIOUS

PDF

86.5 KB Created: 2021-05-13 08:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2dd9b98d31e9ab998b391f79511b631 SHA-1: 7e8365521b829a457bb0714f00ba3f9272100e34 SHA-256: d8dd00b92d01cdd2f4cd0557c48224ab3e67167f978d7fd9eb146aa85a5c4ab3
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing or trojan. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is https://golowaki.ru/strik. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=different+word+for+visual+representation
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/e761a17.pdf
    • http://pofuxubilet.sportsontheweb.net/tevinotap.pdf
    • https://vadopesi.weebly.com/uploads/1/3/0/7/130738994/figorumipapenibog.pdf
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/vakujupumare_jevato_saxonolal_wasosepudivu.pdf
    • http://zabovawupe.mypressonline.com/duxarevetepalalibek.pdf
    • https://xokotenesuku.weebly.com/uploads/1/3/1/4/131438709/3288660.pdf
    • http://zifufarox.getenjoyment.net/becoming_a_good_leader.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/libeganot/how_to_get_a_drivers_license_in_new_york_for_immigrants.pdf
    • http://tuzajobiwazotuf.epizy.com/55280848716.pdf
    • https://uploads.strikinglycdn.com/files/a8b5402a-6065-4e38-b4f6-c3d7ae827e2f/jupatosi.pdf
    • https://s3.amazonaws.com/zidosozawok/how_to_be_a_great_christian_mother.pdf
    • https://uploads.strikinglycdn.com/files/0ee2a744-2ff1-4546-9cd7-af0daefe47e8/rabemizikufaleju.pdf
    • http://repoguter.epizy.com/how_difficult_is_the_cpc_exam.pdf
    • https://uploads.strikinglycdn.com/files/66fd74e7-42e4-4063-8b77-e686743aff0c/how_to_put_x_in_a_calculator_ti_30x_iis.pdf
    • https://uploads.strikinglycdn.com/files/4c099f51-627a-4995-9ec4-9fc31999e9e5/padi_open_water_diving_depth_limit.pdf
    • http://nofifejagarenut.epizy.com/difference_between_c3_and_c4_cycle.pdf
    • http://nibudomatimemi.rf.gd/memofugawixabuxupubividib.pdf
    • http://lobopekogolo.onlinewebshop.net/ingles_sin_barreras.pdf
    • https://uploads.strikinglycdn.com/files/6eecabd9-4939-4e8e-931d-57cb6ae7b557/kivalap.pdf
    • https://uploads.strikinglycdn.com/files/1f2fe553-2756-43a5-bbf4-0042fd8dcfbf/gta_san_andreas_superman_cheat_pc_game_download_windows_10.pdf
    • https://s3.amazonaws.com/remuv/glee_cast_baby_got_back.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_off000113bb.bin
eeabd13cb8c6a2a15d1df1f797ea15370d1f1bb5e4373978c4fa709cbe6035b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 5184 bytes
font_01_sfnt_off00012592.bin
c910a5642c9adfde2ad13afd3f5224302c143669fabbe4caef0a41ccf7cc7e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12592 11424 bytes

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