Malicious PDF — malware analysis report

Static analysis result for SHA-256 639a6270a3d8924c…

MALICIOUS

PDF

77.5 KB Created: 2021-05-15 23:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 66c6dfab4cea66d7a2d0841999260f08 SHA-1: ce7ac585114004d7460cf91b5d538b3ca38c289a SHA-256: 639a6270a3d8924ca8bca6b57f33cee29a294a9da136e0594756633e5b987ae7
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on potentially untrusted domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=enterprise+payment+system PDF link annotation
    • http://mpvideo.org/manedugonemijapafudegogodvy7gv.pdfIn PDF document text
    • http://tapalofaxag.22web.org/voodoo_spells_5e.pdfIn PDF document text
    • http://bibilewixan.iblogger.org/vunutebotuginiraririvu.pdfIn PDF document text
    • http://cherrypimp.online/pekutivipizimazbv4cg.pdfIn PDF document text
    • http://kirivil.iblogger.org/46217855184.pdfIn PDF document text
    • http://dekopubetalukaz.22web.org/wisaziwexajoxalapula.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/htc_m8_factory_reset_pine8e5r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80ce5912-1c67-4773-adf4-abf614566e91.filesusr.com/ugd/acb48a_ef568589d15d47e1b34ceedd5bde6545.pdf?index=trueIn PDF document text
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_fe3c5f15153a427086c068d308ae7cc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d47fb0-17e2-4938-8020-eb6049e2c091/48442845155.pdfIn PDF document text
    • http://niruzozokaki.epizy.com/how_to_change_pin_code_on_genie_garage_door_opener.pdfIn PDF document text
    • http://kesugonapopuw.epizy.com/zovobaravegusulix.pdfIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_8a828f030a874985bbf97f2d16df5dd1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db34f183-bb88-4615-a6c5-0b98f5a13f9c/why_is_the_online_light_on_my_xfinity_modem_not_blinking.pdfIn PDF document text
    • http://bexinoj.epizy.com/schwinn_bike_trailer_double.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5baef110-4f11-47e4-bc2a-139d92e70c0a/59032621242.pdfIn PDF document text
    • http://dipumekamerara.rf.gd/blind_willow_sleeping_woman_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8077abc-52c0-401b-9889-b80b968140f8/lawnboy_mower_bag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43331636-c6c9-4a80-bb26-3d6e0c8dd48b/pepejagukikina.pdfIn PDF document text
    • http://vibulowivez.epizy.com/35165598972.pdfIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_a2c0146455f44f2b93103d7c3d440635.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_7f963758c0294639a1d9e55dd5c50da8.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_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 4992 bytes
SHA-256: 97be74a08a019af0372d2c4df1ac57a55ca07e87393c394bc3b55a20b6ca2832
font_01_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 10588 bytes
SHA-256: a798b14ad1be0490d0cceb002283c2ccc55494e2befdf706dcc46021ad6dbb13

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