Malicious PDF — malware analysis report

Static analysis result for SHA-256 e437e687c631adc7…

MALICIOUS

PDF

85.4 KB Created: 2021-03-29 23:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4955aae27caea9321d540f00c23c37e7 SHA-1: 718cc4cf47860a1f36640f66b6372ac3dea6726b SHA-256: e437e687c631adc7e0c11e48879b3102cda23a8c1698ccd59b00257a28a27a2a
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://dugedepap.ru/award?keyword=truth+table+discrete+math+pdf PDF link annotation
    • http://prechambre.xyz/20047931650kk83o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5fd806428dc28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_6014944276a01.pdfIn PDF document text
    • http://about-igsupport.com/dyson_dc35_power_cordmj7zs.pdfIn PDF document text
    • http://formulamoney.top/93159168320bjm06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_603aaa4ca7be6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_60500ea99e626.pdfIn PDF document text
    • http://dreabling.online/how_to_learn_amazon_web_services_quorafzkv7.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/c006e1cc-39a2-42c0-b685-5566e55f170f/breadman_tr520_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/lista_de_parabolas_de_jesus_en_la_biblia.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_c16ea1eb24114603a179fc1b6819f24a.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_5822c9eb1a4e424d99318ef7f1733795.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/427cecec-6861-4f45-9ee6-656397cc486f/9635776517.pdfIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_254b37df647845338286058de5a32384.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b03fdd-d721-4c97-b9ef-1227b2e44c08/schumacher_electric_sc_1304_15_amp_battery_charger.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_2bac06488b804c81b5e366a9a9b8c6f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paropabaru/bernina_sewing_machine_repair_birmingham_al.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/octopus_controller_apk_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d92d135-2e30-4af8-881b-92a6d43b36c4/pobekemosexijeregesusiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435f4681-004f-45fe-9fdb-75b89bd977ea/4160531644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/884dee53-15ed-426f-b702-32a82fb1d739/jomawekazijufozigufala.pdfIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_f02ba55646b7476eafe7ce2c90546b23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc5a58b-0314-4934-9b6f-203faf3bcfb5/686652978.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_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 5484 bytes
SHA-256: a617373b2c9b93aeb6bb4b11812267a8842e1485c4305c83d72dfe83fb4aae02
font_01_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 10628 bytes
SHA-256: a71dc737c56022e2eccae458aa62fa29fab90fe14053cbfbc1e8c6c812babfaa
font_02_sfnt_off000131cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CF 16392 bytes
SHA-256: 182d867c8001700e52316a2c5005d52652d5ac262789151759d35d2793eb2042