Malicious PDF — malware analysis report

Static analysis result for SHA-256 506b8f9266078dc6…

MALICIOUS

PDF

92.8 KB Created: 2021-05-11 21:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1c680930402b56e9bccffd951ba1e57c SHA-1: 6460082c38b0646e49ed274916cb58526fed5e2e SHA-256: 506b8f9266078dc6d9d17d7268c05f28c52eb2fcc5c9c0eb80f85efe32a50f5d
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized content, a common tactic for phishing or malware distribution. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a link farm and a redirector designed to lure users with promises of free content. The primary malicious URL identified is https://jumiwimov.ru/strik?utm_term=telugu+child+stories+pdf, which is likely used to host or redirect to a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/strik?utm_term=telugu+child+stories+pdf PDF link annotation
    • http://workbykoder.xyz/avengers_endgame_full_movie_free_youtubevc5rz.pdfIn PDF document text
    • http://goldstein.capital/lokikinuxoxijigesugek73ued.pdfIn PDF document text
    • http://kokawerawofovi.iblogger.org/prisms_and_pyramids_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca1d69c-6368-4705-8ce0-fd28a2970f8f/roomba_e5_vs_960_vs_i7.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/spider_man_ps4_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/53044322663.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/male_catheterisation_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/koxegakagixenuvewarud.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/burning_of_the_bridge_wrightsville_pa_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/69625336061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab33781b-242e-4b9a-830a-3aa2988ef0e8/49126043670.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/xiwijulujebubu.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/koburamuwutasagefuvifak.pdfIn PDF document text
    • http://nixikivike.epizy.com/is_anti_inflammatory_diet_healthy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96eba2f5-beb6-4c16-a6dc-c1d9b6a976ad/zowumefan.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/hp_7525_printer_alignment_failed.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_af3b723e86d3413d921086aaf84bf218.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0a0f0b-776f-4366-a1d6-843ae0e9ba22/rufizepesi.pdfIn PDF document text
    • http://xiposebajuremi.rf.gd/garumisemiruselonuxukit.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_509cb06ef86a40b6a1fda139b4e1a866.pdf?index=trueIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_f3e72af6f2e64c609fa42d52deda2b3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc7cad01-f281-4308-9871-b092a4ba4115/new_love_story_movie_2020_hindi_dubbed.pdfIn PDF document text
    • http://gapitufukiwiti.epizy.com/tonupof.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 5156 bytes
SHA-256: 33a2ac8fa3ec15841b10946d8734c63e78c058fce4fe3b3115bbf80127d00259
font_01_sfnt_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 42828 bytes
SHA-256: 135e1793be674556a03a956e6369aac00070abe4fd6c4d98fe13dfd871c34910
font_02_sfnt_off0001408d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408D 10356 bytes
SHA-256: ac12bfa5869899bb8de5a391a701058b8eae7dad5801857cffdcaff50b175c30

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