Malicious PDF — malware analysis report

Static analysis result for SHA-256 be700b440a591568…

MALICIOUS

PDF

80.3 KB Created: 2021-02-25 00:27:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 181e594103b8891c1d9634198587e344 SHA-1: 0db8941c4f0d4f5951826eee4ea3d6425e94f945 SHA-256: be700b440a591568f860f9bdb18c6ec36afc4060b4571ef1d49529cd23e9489c
126 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('seumenha.ru') that appears to be part of a link farm designed to redirect users. The PDF's structure and the presence of external URIs suggest it is intended to lead the user to a malicious website, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=mastering+physics+chapter+1+answers PDF link annotation
    • http://fodamibokaf.66ghz.com/nijojapulajese.pdfIn PDF document text
    • https://cdn.sqhk.co/gedugari/5gfghBk/real_and_fake_airpods_2_box.pdfIn PDF document text
    • http://arnautmebel.ru/zbigniew_brzezinski_the_grand_chessboarduehql.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/tikikusotixamifavagas.pdfIn PDF document text
    • http://belkwigs.com/kleptocats_2_cauldron_ingredientszh280.pdfIn PDF document text
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/f6890f146ff41a.pdfIn PDF document text
    • https://jexujomasok.weebly.com/uploads/1/3/5/3/135343442/4002745.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/bixetedotemowaxuriv.pdfIn PDF document text
    • http://autobuff.xyz/5116862661oy6v2.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/91966617969.pdfIn PDF document text
    • https://mowazaxof.weebly.com/uploads/1/3/4/7/134704653/tirazowetat_xofaroge.pdfIn PDF document text
    • https://tefufujilidawa.weebly.com/uploads/1/3/4/5/134578337/siletowosar_saropetejuka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sidepojedava.myartsonline.com/marine_corps_physical_fitness_program_mco.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/how_to_fix_a_gamecube_disc_read_error_on_the_wii.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/which_garmin_handheld_gps_is_best.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/how_many_calories_are_in_a_iced_latte_from_dunkin_donuts.pdfIn PDF document text
    • http://lafumiseweno.epizy.com/sets_relations_and_functions_class_11_in_tamil.pdfIn PDF document text
    • http://livirava.atwebpages.com/jumitosanusov.pdfIn PDF document text
    • http://pusonuduwixi.epizy.com/56803772838.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/torewadefewamit.pdfIn PDF document text
    • http://mowumaja.epizy.com/direct_and_indirect_characterization.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_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 5416 bytes
SHA-256: e1db2063290497b170835f9942f8c4a1763b1bc648e850b30184b142058826b8
font_01_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 11092 bytes
SHA-256: c949f855eb19ebc555182317a7495ea64f665dba005b714d165633fcb0ae2865

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