Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f386c498226be47…

MALICIOUS

PDF

86.7 KB Created: 2021-03-28 15:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fc527bbef9b47a88586a33db3a3fdb5e SHA-1: 10f92ad3fccfa93aaad9f27dfbabcf29328388f2 SHA-256: 7f386c498226be47292553bd01b3dd51049859c87a5976a8312669efe49312b3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/award?keyword=ser+bachiller+2020+sierra+pdf PDF link annotation
    • http://vejuwagor.iblogger.org/star_map_orions_belt.pdfIn PDF document text
    • http://gapilojazixo.getenjoyment.net/22994012655.pdfIn PDF document text
    • http://bella24.xyz/verizon_wireless_mifi_unlimited_planldm8o.pdfIn PDF document text
    • https://cdn.sqhk.co/kukelagalefe/ijCUkXy/38486296515.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/Wz5B6ig/rugukutapowasixakefo.pdfIn PDF document text
    • http://foyou.store/91772135955a40sp.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/bezojajotanufafafesibu.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/O7AmjhX/jinimeterazafiza.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/89048717734.pdfIn PDF document text
    • http://vanlit.ru/9613376189121tbh.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/64190832018.pdfIn PDF document text
    • http://kavuxusexilu.22web.org/what_is_the_order_of_books_in_the_after_series.pdfIn PDF document text
    • http://kozevajalun.22web.org/2169684388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_1d07d6f31914403bb63329ea8c8663da.pdf?index=trueIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_922639a661c54befa400bda6b02d8970.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_3ba889cb75eb47adbaa34522b365d93d.pdf?index=trueIn PDF document text
    • http://getorimojaz.rf.gd/vazavokokulatofi.pdfIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_20fd0036521e4280998b7d313d736b80.pdf?index=trueIn PDF document text
    • http://rabatelekovufar.myartsonline.com/agonistas_y_antagonistas_dopaminergicos.pdfIn PDF document text
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_0e53f3f312624442ab8d9bddd5aafce2.pdf?index=trueIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_2cf6f45d250849eaaa54d57c8bbce8e0.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_013b02f574df4ccda422f9fb0b28518a.pdf?index=trueIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_ad708f1a82c34a57af1e4e1b970adb0e.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_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 5760 bytes
SHA-256: a630bbb3009904ea78a38fed56175dac91ac69ce2b78e3713560c8be9a4b600f
font_01_sfnt_off000122fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FA 12624 bytes
SHA-256: 40b89b9b7ba1a07298ce2aa50cf3872fa677cfc564e0ce9aca93451d59223396