Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e0f7a7154c1fc9…

MALICIOUS

PDF

79.3 KB Created: 2021-03-16 23:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71f1bbc31f5826825c0c696b46ac5175 SHA-1: d3020d9a1e957245a36ce96df789a1409e762bff SHA-256: 90e0f7a7154c1fc94bdfa12c3dc2a914e08ff2ac396d72f38add073dcaa091b5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to PDF files with SEO-like slugs, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/strik?utm_term=what+is+the+most+important+dietary+complex+carbohydrate
    • http://detonic-italy.website/formal_definition_of_conditional_probabilityvlzy8.pdf
    • https://ripumoravoramex.weebly.com/uploads/1/3/1/6/131606135/1875394.pdf
    • http://limecash.xyz/fish_dichotomous_key_lab_answersq2apd.pdf
    • http://imedo.ru/54319529373yedec.pdf
    • https://cdn.sqhk.co/vunofufi/S8hgQP8/warojaralifutuxe.pdf
    • https://cdn.sqhk.co/lukavago/ifmQgiX/color_shift_wrap_avery.pdf
    • http://reduslim-buy.site/samsung_un46eh5300f_wall_mountpc9tm.pdf
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/tepelofa-rikivejud.pdf
    • http://ergors.space/medieval_2_total_war_americas_guideuvhw4.pdf
    • https://cdn.sqhk.co/bopelara/a2qjjpE/emperor_and_beauties_gift_code_2019.pdf
    • http://top-shop-store.website/fewewezetesexagezakesikabhwc72.pdf
    • http://islta.fun/stephen_king_desperation_movie_trailer9vefj.pdf
    • https://cdn.sqhk.co/moturira/06sjbgc/fun_words_that_start_with_c_or_k.pdf
    • http://trells.space/bidderbadge_auto_auctionrbwg6.pdf
    • https://xugugizebe.weebly.com/uploads/1/3/1/4/131482894/2196352.pdf
    • https://cdn.sqhk.co/kinibemazoz/4ieiONR/call_of_mini_zombies_hack_2018.pdf
    • https://cdn.sqhk.co/tememagitapo/b3Vhaja/baxosixivobofuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_90aa4832b3704b678c87f623f1259741.pdf?index=true
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_582801c60ec74c8099e67bae53aa6b3c.pdf?index=true
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_46098710b37d4e43826aebd690df290a.pdf?index=true
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_51a9c08495b143c89a8cef6947ac30b6.pdf?index=true
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_93cd1bfc5903422d959d5c2fdf113d0c.pdf?index=true
    • 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_off0000f81f.bin
92437be631611b9999f323fe3f0ad071e0451d42de09ab86da3b63dd06b3832c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 5636 bytes
font_01_sfnt_off00010b2c.bin
2c95ce4fd643974f36ac7f52dfe28ca5f06099392fa20464725ae3e4970bc6da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 10604 bytes

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