Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3fe612d92bdef3…

MALICIOUS

PDF

86.9 KB Created: 2021-06-14 10:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b899cddb8ac29d375f595bfc5ca8d092 SHA-1: b6d26cee980d533b60c3ca650e080bf90bdf1cac SHA-256: dd3fe612d92bdef33f109b8d28feba8f2f1e472c772395b416a4b0cd13c9b780
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 0.9980

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://laborke.ru/pbw?utm_term=best+minecraft+windows+10+hacked+client PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409610/normal_6040400b39ffe.pdfIn PDF document text
    • https://busuguzokiw.weebly.com/uploads/1/3/1/4/131406797/jowasunobi-juxet-liwolevevida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_603aad2030bb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479705/normal_6062231d42201.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4415308/normal_60aff783bc2be.pdfIn PDF document text
    • https://fujelaxu.weebly.com/uploads/1/3/4/7/134704358/cf3616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_603e160393912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_606c0d8433f79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476010/normal_5febdffce1668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386622/normal_5fc693d165b33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_60465191ef5e9.pdfIn PDF document text
    • https://lolosovosozo.weebly.com/uploads/1/3/4/8/134882251/munugidi-xozedeve.pdfIn PDF document text
    • https://nofoxevejumumu.weebly.com/uploads/1/3/1/8/131857054/5702439.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namimutigete.pbworks.com/w/file/fetch/145219284/65397500814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d243fd6-d78a-4c7c-a52d-09984006c014/teaching_english_as_a_second_language_online.pdfIn PDF document text
    • http://ridezerarumu.pbworks.com/f/white_fox_studio.pdfIn PDF document text
    • http://legesir.pbworks.com/w/file/fetch/144718833/five_nights_at_freddys_4_download_ocean_of_games.pdfIn PDF document text
    • http://watapabipos.pbworks.com/f/bible_dingbats_with_answers.pdfIn PDF document text
    • http://wenitudodub.pbworks.com/w/file/fetch/145083930/vigurufifolatogef.pdfIn PDF document text
    • http://molitutolu.pbworks.com/f/37468085358.pdfIn PDF document text
    • http://mokakiw.pbworks.com/w/file/fetch/144722058/algebra_2_pretest_answers_key_coronado_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac62cb77-9040-4431-a5c7-3626c3b9215d/what_time_is_early_bird_special_at_texas_roadhouse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748fe05b-d29e-4bec-8d82-024767e92375/87387191577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2396710b-2bcf-4f23-963a-b4748210f051/geometric_sequence_formula_for_the_nth_term.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a43342d2-e7a8-411a-b303-b159b2ec9f1f/gunobamopiponunevibun.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 6620 bytes
SHA-256: ecea82608df6d4035423f12701e54b901bbd43c0c2315fbe5ef9dc2d6ccd5e6e
font_01_sfnt_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 5660 bytes
SHA-256: adb0efcb8afd6e2ea4d7bc2723a90d2f8b8b7909ecbbec69fd883247f0a88c7c
font_02_sfnt_off000118ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 3448 bytes
SHA-256: df8ca4f3b355c34e9e4df112392132ae6fe05313151fe20af5c31f3f35392518
font_03_sfnt_off0001263b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263B 11244 bytes
SHA-256: 5cf8b38d3f4f6d161d48f08870604d0f913e2c596c38f5e3a060713fdf49f483