Malicious PDF — malware analysis report

Static analysis result for SHA-256 2829e68606aaed0c…

MALICIOUS

PDF

73.7 KB Created: 2021-03-20 08:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e8cf9a4573c7021cf44d6cbdc167d23b SHA-1: c281593844d10ed548cc7dd4ead93b9522ca6444 SHA-256: 2829e68606aaed0ce629119f22bd8d2e9f782a330a28c023cbca6dd8d2053862
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary external URI pointing to a suspicious domain. Heuristics indicate the PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious. The document body, though heavily obfuscated, contains text related to medication side effects, likely a lure to encourage clicking the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://botokaw.ru/strik?utm_term=side+effects+high+blood+pressure+medication PDF link annotation
    • http://jelojutu.sportsontheweb.net/introduction_to_automata_theory_languages_and_computation_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/panazomuv/gfv5eie/telegram_download_app_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479707/normal_5fedf3b8cf6fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413000/normal_5fecfc8aca07a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fe07094b0831.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_6009822ca9031.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/best_primo_bottom_load_water_dispenser.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_60303d3597918.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/cij6FAn/dictionary_app_for_pc_offline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5fe954b730ccd.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/71573622160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489992/normal_60246a1f83816.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/hfZzGih/one_man_under_the_sky_backpack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475874/normal_5fde2e714afc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484635/normal_603d221d85211.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowilewegiwo.myartsonline.com/womidutenoxedowapodanivo.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/18131241558.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_1c2a3a1fe1ec4c59b8016b7c3d0555bc.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_9306ecc72e094cf8bc95eaa97986017e.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_eddfc46895c24baaa6e2513a0a2932e1.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_e9aeb6a3f8d54c2ab6227540de7ae326.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/carlos_burity_nguma.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/80101358155.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/google_slides_timeline_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/reid_street_primary_school_darlington_ofsted_report.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_b73568d74a2a466caa38be0e041ca9b0.pdf?index=trueIn 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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 5812 bytes
SHA-256: a366640efd6ba3773bc4f37976c6f21bf99db5f1cace4c947297ac080383ed4c
font_01_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 10828 bytes
SHA-256: 717370ae29a2dd3d99eb514f5a5b33e5928493369ecced115fbef4028fc1155b