Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ec91d034a231c9…

MALICIOUS

PDF

68.8 KB Created: 2021-03-12 09:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9a8d319447a2b6cb84a51fe22dbc43d0 SHA-1: ba8088753c8a019b82d3dbfe45a197fdb38d52cb SHA-256: 17ec91d034a231c904f2fa1683f2667a73a0ca6f2b16f175342f811a7658fe65
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary malicious URL identified is https://mezovuduw.ru/strik, which is likely used to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=c.s.+lewis+mere+christianity+audio PDF link annotation
    • https://cdn.sqhk.co/puvivefujef/hjhdDig/40467290717.pdfIn PDF document text
    • https://cdn.sqhk.co/giwibilawa/iiji8ic/kung_fu_tea_delivery_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/jd1ifib/the_world_of_magic_leveling_guide_ranger.pdfIn PDF document text
    • http://zubosoxi.22web.org/fundamentos_de_algebra_lineal_larson_6_edicion.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/bedgigf/mad_truck_challenge_racing_mod_apk.pdfIn PDF document text
    • http://fosukimiten.22web.org/samsung_ak59-0149a_remote_codes.pdfIn PDF document text
    • http://bowoporoj.iblogger.org/lopurobuledijakinake.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/jdhbhiJ/secret_of_mana_2018_soundtrack_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_e8fc4a44ceaa47459d663179bbf4011b.pdf?index=trueIn PDF document text
    • http://fofanab.epizy.com/24813753713.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_c29214ba460a482b903d445106b7e152.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_03ae95d0861b43df92be9a5863c135de.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_08983ab713e94e77a353575584864a31.pdf?index=trueIn PDF document text
    • http://poxemibusap.epizy.com/how_do_you_wear_a_mask_without_steaming_up_your_glasses.pdfIn PDF document text
    • http://jodewejuwuw.epizy.com/joxetexudurojibifulum.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_621421b33d974f86bac09b27bde6d565.pdf?index=trueIn PDF document text
    • http://rodobokojezaga.epizy.com/lufenirovefikagimuregaj.pdfIn PDF document text
    • http://sakikuzugodo.rf.gd/sezagosegolubamujoritevo.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_84499b7944fa43358c2d365fa773c998.pdf?index=trueIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_f9723fb88c28411b9e2d3b0b53773686.pdf?index=trueIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_501e1705fd3f4c7dbc4e63602abcfd34.pdf?index=trueIn PDF document text
    • http://bowomufe.epizy.com/note_20_plus_price_in_south_africa.pdfIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_a42da01b09e24850a418b7543d9662d0.pdf?index=trueIn PDF document text
    • http://pugupokevimukov.epizy.com/active_and_passive_voice_past_tense_worksheets.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 5312 bytes
SHA-256: 19ba7ef81c60fe13ea2902750999e0d47539cdee281c176470f460f9a166ba19
font_01_sfnt_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 10464 bytes
SHA-256: 63ba792c7049fad5790960346dd04e3187a7cf3599f6bcc7b4b5073afaa91dd8

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