Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5f20c1bafeca69…

MALICIOUS

PDF

76.2 KB Created: 2021-03-29 14:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 937ddf847e0c5428390d3eb311ae5edd SHA-1: 56dda23b80e9cbab78283e6683cd774b92c1189a SHA-256: 6c5f20c1bafeca69b3ee481cfc014929055add455148ec0cdaa75f6fdb6fa7ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://zajinet.ru/strik?utm_term=graco+travel+lite+crib+mattress+sheets PDF link annotation
    • https://kefagifugujog.weebly.com/uploads/1/3/0/8/130813645/5ae98045893149.pdfIn PDF document text
    • http://xviiivbgz.com/stc-1000_temperature_controller_manualqt7rm.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/lusatinoxadew.pdfIn PDF document text
    • https://jerolukemotib.weebly.com/uploads/1/3/0/8/130874115/dowov-bozijaduz.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/zegadejawumosul.pdfIn PDF document text
    • https://ratisajaruniz.weebly.com/uploads/1/3/1/4/131455275/a35a9ddab246.pdfIn PDF document text
    • https://zezexofoji.weebly.com/uploads/1/3/4/3/134344156/zujudo.pdfIn PDF document text
    • https://tafiweva.weebly.com/uploads/1/3/5/9/135993394/0225c559.pdfIn PDF document text
    • http://productwood.ru/rudumas0ls.pdfIn PDF document text
    • https://dajoromu.weebly.com/uploads/1/3/4/3/134309711/lafes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://badamowafe.onlinewebshop.net/97065726171.pdfIn PDF document text
    • http://kamigawox.atwebpages.com/acl_tear_rehab_protocol.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/how_much_oil_does_a_cub_cadet_xt1_take.pdfIn PDF document text
    • http://tununik.epizy.com/whatsapp_application_for_jio_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/56253959240.pdfIn PDF document text
    • http://tuwelifijija.rf.gd/43563059624.pdfIn PDF document text
    • http://varitumowu.rf.gd/potozimezenudubi.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/87367353678.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_off0000d387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD387 5268 bytes
SHA-256: a1ca3a92e9efbd3535c4b2bcff48cf8d74ea9f6d56c95d100363888307768098
font_01_sfnt_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 11648 bytes
SHA-256: 4f5f70d08b332ba4d34c05145125a3115ff35d80b410f72860271fbe84b73f58
font_02_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf

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