Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b90fdfa1a99dccb…

MALICIOUS

PDF

75.8 KB Created: 2021-03-28 18:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 783b1a93bf29e863eed77a9de7e80a12 SHA-1: 083fb4938a22c2409da48309e98ca4c4b6c92387 SHA-256: 2b90fdfa1a99dccb396ad7c0ad1dbddb0ed7cd4725b8476765aee430004dfdbc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a domain ('mezovuduw.ru') flagged as suspicious and associated with a phishing lure related to a book title. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=biochemistry+third+edition+h.+stephen+stoker+pdf PDF link annotation
    • http://milanomoda.site/far_cry_5_alien_mission_locationyz3vy.pdfIn PDF document text
    • http://tk-pobeda.site/what_is_the_primary_focus_of_managerial_accountingfqkpz.pdfIn PDF document text
    • http://cucoupon.info/fluval_306_media_kitr686f.pdfIn PDF document text
    • http://gatorama.site/ue_megaboom_2_for_sales5rai.pdfIn PDF document text
    • http://homearfes.com/tumukelumuputogoha4s.pdfIn PDF document text
    • http://com-copyrighit.com/hacking_with_pythonn1ri3.pdfIn PDF document text
    • http://50offstore.info/75420755310qfyxa.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/Cnjjg6h/power_up_big_shark.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/icj5get/10082202632.pdfIn PDF document text
    • http://newberginvestmentproperty.com/vovebakeperowuviwodiw2a94b.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetozativ/fAjoUKg/97948430850.pdfIn PDF document text
    • http://koreanluxe.com/google_maps_roads_api_android_examplemen4p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bfc4c7-0de0-4817-935d-1380ab7e39c9/pefavovubusudatur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5efea1e5-13da-4171-8067-dab768e80588/macbeth_act_4_scene_1_apparitions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4084aa9-c5de-466d-ae15-fc2311fe1e23/the_five_thousand_year_leap_author.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/99171884199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a4b65f4-62a7-4f65-b04b-2803d336a639/xejofixutuzefefif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/535efb6b-2e01-4047-86af-c79bb9b12c61/goxanaxumajotij.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/oral_biology_textbook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf24952-f3f4-4266-b88e-f4ad82c934a4/how_to_explain_the_law_of_diminishing_returns.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD265 5400 bytes
SHA-256: 5b3ccfbdf233ec91075f074170194bcc1bda08522284b32700bc2d670dfabed2
font_01_sfnt_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 10976 bytes
SHA-256: eca9b1d8a8613d6a07e0b4af41b1234fd3f9dc3b7810bd75cd0d3179a2512769
font_02_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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