Malicious PDF — malware analysis report

Static analysis result for SHA-256 667687560799c042…

MALICIOUS

PDF

161.8 KB Created: 2021-04-06 02:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1a3ea220d47a32ecdd2bee7af5435686 SHA-1: 8c3295ac14853cd2b0d4124ac51fd253b8547425 SHA-256: 667687560799c0428d2079dc1f20a753ff5de50308aa6f5cfd7df4564eed8d8d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to a 'worksheet answer key', which is a common phishing pretext. The presence of external URIs and link farm heuristics indicates an intent to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/wix?keyword=tapped+documentary+worksheet+answer+key PDF link annotation
    • http://manidat.sportsontheweb.net/unsquare_dance_piano_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409797/normal_60553872ad4ad.pdfIn PDF document text
    • http://ganedoxumizaj.sportsontheweb.net/suzuki_250_atv_carburetor_diagram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_603923949200a.pdfIn PDF document text
    • http://trokot-new.online/jikojefokae45.pdfIn PDF document text
    • https://ropifupagefe.weebly.com/uploads/1/3/4/5/134584424/sefir-xanukumena.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/2863080.pdfIn PDF document text
    • http://websecurer.tech/the_joint_probability_of_two_independent_events_a_and_b_is_computed_asys5sg.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/juxtaglomerular_apparatus.pdfIn PDF document text
    • http://kadaxejob.mypressonline.com/the_angel_experiment_book_corin_grillo.pdfIn PDF document text
    • https://bixirugabo.weebly.com/uploads/1/3/0/9/130969405/dituboboko_pivipasebiwatod_bukasiga_womor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/zukanixusako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2503ecea-9e37-4e89-8ae2-ef13072eb626/diablo_2_lord_of_destruction_plugy_mod_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/kogokesejemiserug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c472425-09dd-4246-949f-6fe54e739e7e/jopodikorirejadimifaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303758b8-2416-4b66-8d1b-574225e2bbe8/59576065005.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/13492897220.pdfIn PDF document text
    • http://terumalok.atwebpages.com/weighing_scale_calibration.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_off00024137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24137 5488 bytes
SHA-256: 7f288a1e3b22de340a56dd6f7b60582296f35bb10cb3781a6f41a64e427cfca3
font_01_sfnt_off000253d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253D5 10916 bytes
SHA-256: b7f6990e12e8dec7f79a88ba32ede0de67e42e139034e0581a253a813f658111

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