Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9226f848911a07…

MALICIOUS

PDF

80.0 KB Created: 2021-04-03 20:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0081beaa206d0dd542f8d9466b3f7b84 SHA-1: d2c6866e794854e25c9156573691c40a103abea2 SHA-256: 3b9226f848911a077511fa56a76078ebc6f4eb41f1fff63db7109545ea93cdd9
196 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which are to domains associated with link farms or potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a large number of outbound links. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests that the document may be part of a multi-stage attack, potentially leading to a password-protected archive. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/award?keyword=vejiga+natatoria+pdf
    • https://cdn.sqhk.co/zisujidixa/ihia9gi/87706675874.pdf
    • http://tulumobutu.22web.org/que_es_un_antibioticos.pdf
    • https://cdn.sqhk.co/fekoguwiwu/dRgq9eK/3d_free_kick_football_games.pdf
    • http://xabidewukolesas.66ghz.com/32183368839.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f17b8e0c-7256-4e1f-a38a-0efa557878a5/45007686212.pdf
    • https://s3.amazonaws.com/sorogamat/sefofesewumaner.pdf
    • http://rirafibokiraj.rf.gd/aopa_flight_planner.pdf
    • https://uploads.strikinglycdn.com/files/7360febb-31ab-4a67-ab6d-a62128e6bb4e/how_to_write_a_report_on_industrial_visit_give_an_example.pdf
    • https://uploads.strikinglycdn.com/files/5afc590c-bf5d-4a2e-87b0-9a41d9c12ae9/29347019474.pdf
    • https://uploads.strikinglycdn.com/files/ec76b89d-0e81-4116-8d15-3580c8675513/noxuxajipurozafefu.pdf
    • https://s3.amazonaws.com/pasawexawinogad/samsung_55_inch_smart_4k_ultra_hd_hdr_qled_tv.pdf
    • https://uploads.strikinglycdn.com/files/2344c24a-7a08-48eb-ab4b-766f0ad58b0a/how_to_update_zoom_on_mac.pdf
    • https://s3.amazonaws.com/gedesisumi/37356750386.pdf
    • http://mevetilozavasep.epizy.com/after_before_worksheet_for_grade_1.pdf
    • https://s3.amazonaws.com/satulibaren/password_keeper_blackberry_apk.pdf
    • https://uploads.strikinglycdn.com/files/d093ea10-adc8-4cf2-a780-1fa087686932/how_do_you_fix_a_garage_door_opener_that_wont_close.pdf
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_e96fc9a8f8884e21abf925432e69ee57.pdf?index=true
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_3f1c87cfa13d4e578cf243d4ea5be963.pdf?index=true
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_6fa64f9932c24be4909eaa910130e13e.pdf?index=true
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_2393120fc55c4cdba0730dbe5986f818.pdf?index=true
    • https://uploads.strikinglycdn.com/files/391941f7-a080-460e-9a0c-5c4b1a3d4d5e/seremajemoxirapiwibe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a1.bin
38b78fb6c16b2c464a2e473900f40b05705b03c925faafe73862760e41ba6203		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 5040 bytes
font_01_sfnt_off000109e8.bin
c5e0bfdb46b7d36b6e216fd3b93e4e2818c77cdd28c8212f887836df826a9740		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 12028 bytes

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