Malicious PDF — malware analysis report

Static analysis result for SHA-256 d604456e422b76d2…

MALICIOUS

PDF

74.3 KB Created: 2021-03-11 14:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 37303e0f8e8c323ef902c5e3ce08d000 SHA-1: a3d8f0beb441af51c35568d9df211d03309a489d SHA-256: d604456e422b76d2a97888c2bc9197ab6da28f879635121f2eab9c638428df67
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are structured to mimic search results or download links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/award?keyword=worksheets+for+kindergarten+math+pdf PDF link annotation
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/segifekove-zabanoba-romumejotezogub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393028/normal_5fc6047a6a35f.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/56538519310.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/majestic_gas_fireplace_blower.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/mumavuvi.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/keith_urban-youll_think_of_me_lyrics_karaoke.pdfIn PDF document text
    • http://dkblogin-de.com/7244731932nuatd.pdfIn PDF document text
    • http://profapp.pro/xajidugavijusokutugiff6ao.pdfIn PDF document text
    • http://itsamorem.com/common_ball_hitch_sizeswi1na.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5fccf78eca482.pdfIn PDF document text
    • http://vitodibiwanezej.mypressonline.com/arteries_and_veins_anatomy.pdfIn PDF document text
    • http://khareedforosh.com/blue_planet_live_lesson_activity_sheetsb3q76.pdfIn PDF document text
    • http://filanion.online/fujibipevelekebakobez4nme7.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/does_oregairu_have_a_manga.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/big_blue_book_of_bike_repair_3rd_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487432/normal_60324bef0abaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_60376a618b50c.pdfIn PDF document text
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/gitisuwipaxemaz-farax-wamotisogax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://terumalok.atwebpages.com/karud.pdfIn PDF document text
    • http://vedixemalirugi.atwebpages.com/lutepipegufaxukukipotadil.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/cards_against_humanity_online_gameplay.pdfIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/82825027364.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/10537073977.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_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 5500 bytes
SHA-256: 6fa673bc253ba16f10c12be248d781cf595d89ed1a06dce453536fd311be1bea
font_01_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 10428 bytes
SHA-256: 7124b8a6ab853e9e416caed8854495a115a5c627bf05478fbcef04593e3a602f

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