Malicious PDF — malware analysis report

Static analysis result for SHA-256 58cabbda05712730…

MALICIOUS

PDF

83.6 KB Created: 2021-03-11 02:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b865627e4245799a1da941095d7a4a84 SHA-1: 237d57ec8a63f78558b81f51641ea62c856f2919 SHA-256: 58cabbda05712730c0c4e4786bb91fed74fb40e84a838643f86feea122582438
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one prominent URL pointing to a domain that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to medical conditions, likely to trick users into visiting the malicious URL. The presence of multiple disposable domains and link farm characteristics indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/award?keyword=cardiopatia+isquemica+e+hipertensiva+pdf PDF link annotation
    • https://cdn.sqhk.co/senuziker/9ibpgfX/4518518262.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421477/normal_6002ef2b2bbdd.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/quotes_from_a_streetcar_named_desire_scene_1.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/executioner_meaning_in_tamil.pdfIn PDF document text
    • http://weviwoza.22web.org/82338595547.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/tukalosirelejuwuviz.pdfIn PDF document text
    • http://bokazisenu.22web.org/federalist_10_study_guide_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5ff68aca08fe6.pdfIn PDF document text
    • http://tevoriveterusof.22web.org/91966040157.pdfIn PDF document text
    • http://nufapivevavenak.22web.org/define_epileptiform_discharges.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/hgYHw9g/is_labyrinthitis_and_vestibular_neuritis_contagious.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaluzepo.rf.gd/krystal_clear_saltwater_system_for_7000_gallon._above_ground_swimming_pool.pdfIn PDF document text
    • http://fufabufitilaf.epizy.com/pefofez.pdfIn PDF document text
    • http://roxujewov.myartsonline.com/tomonulakidotokusez.pdfIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/76801271659.pdfIn PDF document text
    • http://momesesewoja.rf.gd/lomitomafek.pdfIn PDF document text
    • http://seroritubofa.atwebpages.com/79852933390.pdfIn PDF document text
    • http://sabuxixu.epizy.com/bafirorunabijika.pdfIn PDF document text
    • http://bibikefogive.epizy.com/algebraic_geometry_book.pdfIn PDF document text
    • http://padusij.onlinewebshop.net/19260388081.pdfIn PDF document text
    • http://bowedujo.rf.gd/sefetimedavupagapigi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 5456 bytes
SHA-256: ca0b97c518567b1857565b019cb87b8ff8ee94b65744e8de60a38d3013734a9c
font_01_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 10820 bytes
SHA-256: da382e9962a520603202d4d796fa9593cbab4f8cd9545d55b3a40a8804df957f
font_02_sfnt_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 17188 bytes
SHA-256: fec30cf62785ec72e0d4dae40f7287f54e12eedb00396af47d8ba7b0c2981ff7

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