Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17a17b81fb5cd51…

MALICIOUS

PDF

69.5 KB Created: 2021-03-05 22:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9df9523f97cde50133ae6c55cbad21c8 SHA-1: f0baee646894d1f57780502bd591db4c022826cc SHA-256: b17a17b81fb5cd51b2af400c77d0879f3972b624b56469076a11b1a485234203
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a link farm designed to host various documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wix?keyword=section+3.1+the+rock+cycle+worksheet+answers PDF link annotation
    • http://sunufosabupes.scienceontheweb.net/canon_av-1_film.pdfIn PDF document text
    • http://keysecret.ru/how_to_make_money_selling_real_estate_contractshm0bs.pdfIn PDF document text
    • http://viewcreditscore.info/60192260173hjw5n.pdfIn PDF document text
    • http://urologo.store/488177732k8ato.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/what_is_the_difference_between_grand_piano_and_upright_piano.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/harry_potter_and_the_half-blood_prince_book_age_rating.pdfIn PDF document text
    • http://fituxem.sportsontheweb.net/felugusunil.pdfIn PDF document text
    • http://erogan-columbia.site/how_to_adjust_pfister_shower_temperature8f5wm.pdfIn PDF document text
    • http://triple-doska6.club/28702474465vk0uj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_b407e3a703a442c7b531d1f397ef8103.pdf?index=trueIn PDF document text
    • http://pariwexeral.epizy.com/live_football_tv_apk_pro.pdfIn PDF document text
    • http://tunarijog.rf.gd/minimalist_anime_wallpaper_android.pdfIn PDF document text
    • http://runoxujozu.rf.gd/foxtel_tennis_tv_guide.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_de67e31638c0472b98b599505965ede2.pdf?index=trueIn PDF document text
    • http://ravesezubepad.epizy.com/kifaverozemoberu.pdfIn PDF document text
    • http://viwixalos.epizy.com/xirawirodirevujapepiwaz.pdfIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_64bb964c0ed648eb86c8dd1af5922ff1.pdf?index=trueIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/18062951565.pdfIn PDF document text
    • http://dolizanawuw.epizy.com/speed_60_mbps.pdfIn PDF document text
    • http://rosukijabadizi.epizy.com/takozidikefawuzuforur.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_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 5496 bytes
SHA-256: 4699c7ac911467c5cb9cf5cebd20ac9a0614d32d72f57f3d807d96de92284cd5
font_01_sfnt_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 10152 bytes
SHA-256: ead3f9d9542c108e3aa9f25108ebd3827457707b6eb331def0cb743ce907af8e

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