Malicious PDF — malware analysis report

Static analysis result for SHA-256 435bbaf073c54d0a…

MALICIOUS

PDF

83.3 KB Created: 2021-03-23 01:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cc46271c34f91bf44e74c7d52fe17708 SHA-1: d95ddb7538b32732db90a11d5006777f00441edd SHA-256: 435bbaf073c54d0a46f374548b6ff739b1870fb3695384ae13e781d726160fa1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous external URIs were found, with many pointing to disposable hosting and potentially serving as a link farm for phishing or malware distribution. The PDF's structure and embedded links suggest it's designed to redirect users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://golowaki.ru/award?keyword=bursite+tratamento+pdf PDF link annotation
    • http://bijepitujutix.sportsontheweb.net/81330710553.pdfIn PDF document text
    • http://raisinsapp.pro/jalenawifjiu6.pdfIn PDF document text
    • http://avbox.org/pan_baidu_english_apk2q9dp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375195/normal_5ff635e5d7d68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_60366ff03a37c.pdfIn PDF document text
    • http://trokot-online.xyz/apc_back-ups_es_500_batteryq4cqr.pdfIn PDF document text
    • http://zathkatow.xyz/stuart_hall_representation__the_media_summaryu2ppq.pdfIn PDF document text
    • http://gagogepatajebe.medianewsonline.com/43207066017.pdfIn PDF document text
    • http://rafale.store/5_star_google_review_restaurants_near_meyyld7.pdfIn PDF document text
    • http://ruwosiju.getenjoyment.net/ligonuluw.pdfIn PDF document text
    • http://thepropheticapp.com/99857935366ltgc0.pdfIn PDF document text
    • http://acupofjacob.com/clculo_de_una_variable_trascendentes_tempranaskcndn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_603450a603166.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/dominos_white_sauce_pizza_ingredients.pdfIn PDF document text
    • http://pedron.fun/30450411916mui2y.pdfIn PDF document text
    • http://prequester.online/dapesakapenitusaluq76hv.pdfIn PDF document text
    • http://xifasiv.getenjoyment.net/ncert_chemistry_text_book_class_11.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/bexixize.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/28389070713.pdfIn PDF document text
    • http://socialwave.me/non_spore_forming_bacillijaq7y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xogijowag.onlinewebshop.net/car_sale_contract_template.pdfIn PDF document text
    • http://desejole.myartsonline.com/61295946807.pdfIn PDF document text
    • http://lenofafezanobu.atwebpages.com/exemple_d_une_lettre_de_motivation_en_anglais.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/6070561478.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_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 5204 bytes
SHA-256: 509ef400baffe12afa2069f7272c23f37e14cc9d0371e891356773d825de00b6
font_01_sfnt_off000116ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EA 12972 bytes
SHA-256: 5c951997d6415b8cfa25174acc5fbd63dfc834d45e92b2b5456ff10bff428bc9

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