Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa67370c844e259…

MALICIOUS

PDF

84.8 KB Created: 2021-03-08 23:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 476e5a491db44b720b79d0990dbae530 SHA-1: 976ad06c7f30131a4c201a0d684bda0cbeb0761f SHA-256: faa67370c844e259402e75c5919cbaadde15f9d454f01ac6d5e58c9d25a70a0b
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 0.9990

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://bologen.ru/wix?keyword=composite+function+worksheet PDF link annotation
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/dajavaz.pdfIn PDF document text
    • http://wumakelanatug.22web.org/car_accelerates_uniformly.pdfIn PDF document text
    • http://quickpapp.online/craftsman_113_table_saw_parts_diagramhouhw.pdfIn PDF document text
    • http://hardcreditcheck.info/brother_printer_toner_reset_tn6309p9a6.pdfIn PDF document text
    • https://rurawovupotoli.weebly.com/uploads/1/3/4/0/134017211/1f38ce640d08.pdfIn PDF document text
    • https://nalimaxepizof.weebly.com/uploads/1/3/4/6/134662907/a91a6c4bc.pdfIn PDF document text
    • http://fruit-ita.fun/mexominuwufasukugikizptu4t.pdfIn PDF document text
    • https://vidapuromojesa.weebly.com/uploads/1/3/4/8/134890941/denema_tukazi_nawemiwozofolud_gatupogexozusiv.pdfIn PDF document text
    • http://reduslim-buy.site/bajirao_mastani_full_movie_english_subtitles_downloadzs8vy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/106edb4f-1d71-4b07-a2c1-e0b7ee2a10a1/wejugojasis.pdfIn PDF document text
    • http://kagumaxapa.rf.gd/insert_worksheet_in_excel_greyed_out.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/amway_nutrilite_catalog.pdfIn PDF document text
    • http://tedijafubivot.epizy.com/25326754533.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_5ce5308f297c4dff8fa67969b32d3456.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisazabe/nios_deled_admit_card_2018.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_6e99a25a3bd7421382d91595dc9c8332.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_acbddb6002a74f2c90ece909c19e1d8d.pdf?index=trueIn PDF document text
    • http://tizugixe.epizy.com/55224583310.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/l2_revolution_codex_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/jatadakadovawumokomulet.pdfIn PDF document text
    • http://mimiwuzoxul.epizy.com/kobalt_8_gallon_air_compressor_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dbc4012-c4de-4413-9077-56f2e9353698/the_adventures_of_huck_finn_disney_movie.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_60d3c6f6472449fda02b248684678df4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/janodojivi/hand_saw_rip_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 5076 bytes
SHA-256: 9653be6f6c0670376e5565e036c9e5b8e394dd0f11fedfdcd84593dd5cc2a57d
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 14408 bytes
SHA-256: 885c948295cdb2d3303e7157263ffd0c0b0b592d76fccbc5ac3e664f916279d8
font_02_sfnt_off00013087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13087 16152 bytes
SHA-256: 9dd161ad083bde31f1785977080a21cd00ffd1d65af7312c0685ba069ea0c2ef