Malicious PDF — malware analysis report

Static analysis result for SHA-256 4290e089cebc2289…

MALICIOUS

PDF

96.2 KB Created: 2021-03-10 21:16:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a529df6f5bafb3d2418141318da851fc SHA-1: 5ea798302f100f0da1b047bc3715b19507273471 SHA-256: 4290e089cebc22898d8a8c80f6a02a767f44bc9a315f5f6569ebadeadb08be48
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and multiple heuristics indicate it's a link farm on disposable hosting, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/award?keyword=article+about+educational+psychology+pdf PDF link annotation
    • http://gatorama.fun/dewalt_chop_saw_dust_collectionw4f3o.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/3cUeqif/tivanejesuluzeb.pdfIn PDF document text
    • https://tapogizixe.weebly.com/uploads/1/3/4/8/134897788/7341895.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/fieVwig/kewutas.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/12ieijR/among_us_wallpapers_creative_map.pdfIn PDF document text
    • https://cdn.sqhk.co/zagakobafot/gcANibq/slots_lv_bonus.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/gif0sqy/84304198921.pdfIn PDF document text
    • http://fbdirect.site/mds_3.0_rai_manual_chapter_4mbzdy.pdfIn PDF document text
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/6724595.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/jifesu/equations_and_inequalities_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58e773c6-7f34-46f0-89c8-7868d67e6a6f/how_can_i_get_a_promo_code_for_walmart.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_a300b645301d486ea4d2c88bc1bb4a8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad5c44f-98bb-495b-ab0d-99150a3be177/kinikozavosazik.pdfIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_469b3112cc1d4fc3a6544e7fc66f3ed4.pdf?index=trueIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_61d0e1f1c2f34f75a2cf2b1cbe6cc67c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/borukegasiripoli.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/pejivovusitubozavupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ca7348d-facb-46d4-b402-d4ced255b14d/cosmos_neil_degrasse_tyson_capitulo_13.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/44278417275.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_a0591816005d4028b6ca51c2b3fc4c49.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_1202993cf2ad4fa1a86f1ca6a391bd89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09aa3148-72a9-48e8-b81e-ba798502ec99/35110939311.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014219.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14219 27636 bytes
SHA-256: 8ebc704f58bf6789b34644b79c52382da64d000dd23d1935bfd48be2f2b1df56
font_00_sfnt_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 5648 bytes
SHA-256: 02b19b8174d0a00c9d8f72f877055d2031d28e98b7e429a3e7f66cdc96642fe1
font_01_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 10408 bytes
SHA-256: 9fbe610fb553993d08055de49932863f4374e2f12863a54a02c253689cbcd2de