Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01cb6b85543bd70…

MALICIOUS

PDF

80.6 KB Created: 2021-04-02 08:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 67062ed51aefd26f19c417976bf2a214 SHA-1: f161517339717445754ae720b413aec83bc82158 SHA-256: b01cb6b85543bd70d5c9c28b2c0f93133ab9e213312fe3eb64a33d35e325e453
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to redirect users to potentially harmful content.

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://pelibifir.ru/award?keyword=cardinal+and+ordinal+numbers+worksheet+pdf PDF link annotation
    • http://itgermany.net/how_to_set_plug_in_timern8pa2.pdfIn PDF document text
    • https://lafikekil.weebly.com/uploads/1/3/4/3/134316660/mutajejiv.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/hp_4630_printer_not_printing.pdfIn PDF document text
    • https://vesitunerenos.weebly.com/uploads/1/3/5/3/135338192/fe2609526b5.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/osaka_mrt_map.pdfIn PDF document text
    • http://hotloveme.online/what_concept_is_best_explained_by_the_statement_money_spent_here_cannot_be_spent_therekecrh.pdfIn PDF document text
    • http://bobr.space/36380583931sutv0.pdfIn PDF document text
    • http://legko.travel/blouse_cutting_method_in_telugu_freex93kl.pdfIn PDF document text
    • https://cdn.sqhk.co/dubezaxuviz/cibUihb/four_temperaments_personality_test.pdfIn PDF document text
    • https://cdn.sqhk.co/jinuminex/gcifoBs/abacus_property_group_annual_report_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/OXiggiE/marble_board_game_template.pdfIn PDF document text
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/a13fa4ed778.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/22119617222.pdfIn PDF document text
    • http://basiditdcf.space/dorunun_analitik_incelenmesi_zml3uff7.pdfIn PDF document text
    • https://meripowubizaj.weebly.com/uploads/1/3/5/9/135959363/8335140.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/hjy9hjj/five_little_ducks_sheet_music_free.pdfIn PDF document text
    • https://tofigota.weebly.com/uploads/1/3/0/7/130775321/6877359.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/eAOHh0C/big_bike_bigbike-_magazine._com.pdfIn PDF document text
    • http://okrasote.info/85708365779a0o6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_2e9b05c6df0642538ef5ae5da9f5fb4a.pdf?index=trueIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_802911441ed44419b8bab9f668072b8c.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_45ab910bd3af48b49f316527953010a2.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_da1371d47d0e4ba2ab4ff5211f5a149e.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
    • 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_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 5480 bytes
SHA-256: 6eec797cf01e583db4fbeb2c6f65f40519ee6ded8d3a3e0e90572b88c64c1976
font_01_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 11484 bytes
SHA-256: bfea11a5c32602051139a9229b787ed97de953304e2830e4fb56550ff05df2e3
font_02_sfnt_off00011da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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