Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de5cde729cce0fb…

MALICIOUS

PDF

84.7 KB Created: 2021-03-06 06:11:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 5f13dbe348a9eaa32ae4a78599bc754d SHA-1: 72295a0bf48c279141a09805b5cbfe30dd59d997 SHA-256: 1de5cde729cce0fb7314889c69e6a930d46fb7defbe72c8178d400eca671ee73
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the true malicious destination. The document body, though heavily obfuscated, suggests a lure related to 'act prep books', likely a pretext to drive traffic to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=what+is+the+best+act+prep+book+to+buy PDF link annotation
    • http://chambrehq.xyz/what_is_the_difference_between_plantronics_voyager_5200_and_voyager_legend6p97u.pdfIn PDF document text
    • http://raicen.com/what_is_guerrilla_warfare_meanbytxa.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/akgijha/89341477106.pdfIn PDF document text
    • http://hookup154.online/99059538870vphhp.pdfIn PDF document text
    • https://rukufutuseju.weebly.com/uploads/1/3/4/7/134748195/36ad0.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/32007566905td3sq.pdfIn PDF document text
    • https://tulovituvo.weebly.com/uploads/1/3/4/2/134234708/f2f6d.pdfIn PDF document text
    • http://polystate.ru/how_many_seasons_pillars_of_the_earthr1svv.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/walmart_pharmacy_contact_number.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/iifnibC/32412847968.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/what_does_the_jacket_in_the_alchemist_symbolize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemesuxaw.myartsonline.com/why_is_my_camera_upside_down_iphone_xr.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/artculo_130_dela_constitucin_mexicana_de_1917.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/gavimuveburifomiva.pdfIn PDF document text
    • http://pujumek.myartsonline.com/85423411564.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/how_to_make_a_breakfast_nook_bench.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_0f2c8926b2094bb3b02fa01ccb687078.pdf?index=trueIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_66b2de8d844d413ea3fa59d483935917.pdf?index=trueIn PDF document text
    • http://xakagigoneliv.myartsonline.com/the_cat_in_the_hat_knows_a_lot_about_that_episodes_wiki.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_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 5308 bytes
SHA-256: cf1508b09f573888e8484ecde24278cf7196c67c0720dfd777f0fa34196646c1
font_01_sfnt_off00012090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 10952 bytes
SHA-256: b7f387702c07f2c563d97c208a4275408fd0e3b1dbd283d27e6cf1fe255623ef

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