Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c861a33b13f431…

MALICIOUS

PDF

91.3 KB Created: 2021-03-29 19:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 79eb9ed80419cd0893bf858df0655b7b SHA-1: e8436aed9b0ca63f9b0b61c53109f71c5ac1cc76 SHA-256: 57c861a33b13f431e7bf442325a63ea22c68c0bee2f92df3c634bb799bc9c506
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain that is likely part of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious.

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://golowaki.ru/strik?utm_term=line+6+fbv+express+mkii+review PDF link annotation
    • http://kipegujodup.getenjoyment.net/83089950223.pdfIn PDF document text
    • https://cdn.sqhk.co/tepobugu/jiorytg/mediamonkey_for_mac_2019.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/bsc_1st_year_botany_notes_free_download.pdfIn PDF document text
    • http://lulodexov.scienceontheweb.net/zuxixikiniwuj.pdfIn PDF document text
    • https://cdn.sqhk.co/sapamine/iaqhBCh/71817950274.pdfIn PDF document text
    • https://cdn.sqhk.co/wexazaruko/igh2rC1/du._ac._in_datesheet_2018_hall_ticket.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/Wijhh5v/pexapejatujibofa.pdfIn PDF document text
    • http://pekibimige.mygamesonline.org/65460996490.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/UBhf6NL/60721893673.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/30697547028.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://degevojorak.myartsonline.com/10473378413.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/how_to_pair_polk_soundbar_with_iphone.pdfIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_e76258c27cfa4986a035b43417296f66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/zedafumitifawuzepawol.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_f6ec9c84eccb4b48a82d104c37d93f0b.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_f693b632de054962a76e0724fbff3261.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_8bb768ee8a3f420ba36fcbeded5ab3b7.pdf?index=trueIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_c7144282f5464cc1b6a22fa32ae0f1f2.pdf?index=trueIn PDF document text
    • http://nukilaba.myartsonline.com/callan_method_stage_7.pdfIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_4e0ac8005b3b448bbe18ed1c0dd6ef5b.pdf?index=trueIn PDF document text
    • http://paguxesij.myartsonline.com/dopugadatarevididuvaf.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/pikaduxewox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11849 4920 bytes
SHA-256: 4ef61d45e273a7b239af89be8c14cfbb293af8d5932ae5961a92d0bb79812a74
font_01_sfnt_off000128e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E8 12312 bytes
SHA-256: 84af6fb3e011ba0bf2c9d31f906c7b385e0396056c25339966cdb35f6c95529d
font_02_sfnt_off000151f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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