Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1791cb2e264809…

MALICIOUS

PDF

76.9 KB Created: 2021-03-10 01:18:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8ee38162cebeebbbf1973323a7defd45 SHA-1: b074863418ad296035f3e5bb67cf199781d3a3e1 SHA-256: cc1791cb2e264809d9cb693249b1f3668f15af2a67e10b48ff790f90a23adcfa
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to potentially malicious domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to academic content, likely intended to trick users into visiting these external links, which could lead to phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/wix?keyword=2007+secondary+solutions+to+kill+a+mockingbird+comprehension+check+answers PDF link annotation
    • https://cdn.sqhk.co/pirasemofoge/aozVQQf/disney_princess_dress_up_games_back_to_school.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/ij6gehj/macbeth_act_1_quotes_worksheet_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477658/normal_5ffe9873727b5.pdfIn PDF document text
    • http://doxisolawasusig.66ghz.com/xiaomi_android_one_vs_miui.pdfIn PDF document text
    • http://xrootunited.com/the_silence_of_the_lambs_movie_plot1yhyu.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/jdjfjfg/gudaradotixokufisajez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495257/normal_60078daba2327.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/85699169878.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419650/normal_5fcf6c19cd553.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/how_to_become_a_fluent_english_speaker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_5fd88eb326e77.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/OidhKir/segobun.pdfIn PDF document text
    • http://sadovik.me/minecraft_mob_farm_height4f64b.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzukada/Hjdijii/ganaton_itopride_hydrochloride_50_mg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xinivaj.rf.gd/bible_maps_old_testament.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/18608616378.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/faxegun.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/freelance_contract_template_doc.pdfIn PDF document text
    • http://giworutiw.myartsonline.com/zosetudopudogoxa.pdfIn PDF document text
    • http://fitimulosegi.epizy.com/9436764069.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/95230430853.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/fijulojemavalowugoweximom.pdfIn PDF document text
    • http://vezapuro.rf.gd/malwarebytes_antivirus_free_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/4709747414.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/mexibazene.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_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 6144 bytes
SHA-256: bd560a8f7fb4c7620cd01b1ac50fe908bedda46059274572022a064b1300d887
font_01_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 14176 bytes
SHA-256: 757ebbb9494abd615f8c9b457d9ff45e82e744f097cf72e4f4ea9428c4ab0b31

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