Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50db9ce590b5e88…

MALICIOUS

PDF

111.1 KB Created: 2021-04-12 14:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5539739dae73e1b370e3e36711b10a5 SHA-1: 72c1eccba64fcc19c7e4206b1258409e468b680a SHA-256: c50db9ce590b5e881c513640af1410d6c43dedc2bd56dff1b7a0cee496143921
226 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic indicates the document's content is designed to trick users with promises of prizes or funds. The ML classifier and ClamAV detection strongly suggest malicious intent, likely leading to a phishing site or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://zajinet.ru/strik?utm_term=a+series+of+unfortunate+events+quotes+season+3
    • http://bitalotava.scienceontheweb.net/rexiwidusuloguzasepebis.pdf
    • https://xisofigutuf.weebly.com/uploads/1/3/0/7/130740477/xuden_wesavivovop.pdf
    • http://lulopoboxefon.scienceontheweb.net/38900051087.pdf
    • https://bekazavaf.weebly.com/uploads/1/3/5/3/135327011/kopupefodubuwonex.pdf
    • https://ludugekokokak.weebly.com/uploads/1/3/5/3/135313409/2546358.pdf
    • https://lisubavami.weebly.com/uploads/1/3/4/3/134331762/3023752.pdf
    • https://zerimesatevig.weebly.com/uploads/1/3/4/8/134879836/viwuj-dubinarozinu.pdf
    • http://roxelejabojafe.scienceontheweb.net/the_merchant_of_venice_themes_sparknotes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_06edbf4d317f4bfa8acf5f68009ef3a9.pdf?index=true
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_4c1aad79ffa7421c93a0649d24dcf134.pdf?index=true
    • https://s3.amazonaws.com/votubukaxogilix/93707010573.pdf
    • http://lipeporo.onlinewebshop.net/vatusufawulariliwix.pdf
    • http://sidefometelibib.rf.gd/66509552735.pdf
    • http://jefokilekik.rf.gd/antidiabetic_drugs_classification_and_mechanism_of_action.pdf
    • http://nakunefizuvodu.epizy.com/anthony_de_mello_books_list.pdf
    • https://s3.amazonaws.com/dazinibonofobi/myron_mixon_pulled_pork_rub.pdf
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_36e36c1f05e5495099384e7852edaf81.pdf?index=true
    • https://s3.amazonaws.com/jedobufudajewu/what_time_can_you_buy_stocks_in_california.pdf
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_9c0bae6ae568424f99bf6a88029cce08.pdf?index=true
    • https://s3.amazonaws.com/tuxenipup/coursera_course_answers.pdf
    • http://zedumupa.rf.gd/aura_carlos_fuentes_espaol.pdf
    • http://fukemasun.epizy.com/formula_para_sacar_el_volumen_de_prisma_triangular.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000173af.bin
c6d281278e3591e4fbcf1f49dcdd07ce586414549993762acd3156d6f7f32207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173AF 5068 bytes
font_01_sfnt_off0001850a.bin
885c456b9f7de58aad9ecbcd67c19c85a5587d181edd1ffacb0eec91b68af7a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1850A 11928 bytes

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