Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13cd0032794f684…

MALICIOUS

PDF

85.7 KB Created: 2021-03-22 12:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c0d0fc88d5dd64ed679df0ef44183af8 SHA-1: 9dc6a0d97aaa6b4ab8dbfcbc9219b8dcf16f2a5e SHA-256: a13cd0032794f6847e39c02cae615da3c071b4a8ab6c2f403208ae74edf63c59
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 0.9958

Heuristics 6

  • 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 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://bologen.ru/wix?keyword=universal+sewing+machine+table PDF link annotation
    • https://cdn.sqhk.co/vumuwuxa/qjhEnib/8107314433.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/pifwgfr/little_alchemy_2_combinations_animal.pdfIn PDF document text
    • http://dulugidi.iblogger.org/waperofid.pdfIn PDF document text
    • https://cdn.sqhk.co/dirotiweze/b1hfjdv/vosojugejerolebeputaxusi.pdfIn PDF document text
    • https://cdn.sqhk.co/tifisizeliz/esBgcjh/rimigerigiku.pdfIn PDF document text
    • http://nawukebakesejid.iblogger.org/free_binder_cover_templates_for_school.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/jv36idi/75871927375.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/jyhbaie/47513810975.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/mgcF6js/paper._io_3_online_official.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/jjhe0ih/xcraft_drones_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/gizivapejoko/mihhghb/54856277368.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/wdddhgm/castaways_menu_bonifay_fl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kafopazam.epizy.com/53880994777.pdfIn PDF document text
    • http://vujujejinegu.rf.gd/52937039853.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_94c3b99670694a7d8325d917c8aa503e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f14cf83-966f-4c32-9f05-0ca937c93acd/frigidaire_dehumidifier_30_pint_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cecab540-f4d9-4398-8c41-34cc35272e6b/how_to_pick_peanuts_in_hay_day.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_781e05cd54a4445989bbd920a5cdece8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5446fd3-5d8a-4d74-b0f2-d1e7c43c5edd/how_to_install_my_new_xfinity_cable_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec4c077d-3267-40b0-8724-22be9f15e0b3/my_cousin_rachel_ending_explained_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77eb6ff9-f329-436a-a070-2655502b597f/bokupadiravuziwunovej.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_1a94461666ec4f639b3c27edd21d623e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd542e5c-6a76-46d3-9d1a-016fc8be1dfb/plato_books_to_read.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_b7dbd29175af44e796477fa55d61796f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e1da1c-39cf-47f2-9e28-0d85e0d4f082/rusabugemupafibem.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_7356c04b574146c690d45b444057faa2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c70069-dd2a-478e-a3dd-0b27cd420574/92305308031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1d7315-2ad8-4c72-9a6d-f1403c655ee2/kidde_nighthawk_error_codes.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 5496 bytes
SHA-256: 45d257cd315a63f5db6a430c10a463178ce498aa8fc8d633b095fc92ad8d13b7
font_01_sfnt_off00012589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12589 10176 bytes
SHA-256: 4ad0c531010adfafc901c614539b73c16e6418c40fafe21bf727f7e5b1b00516