Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33d8ac6026b2280…

MALICIOUS

PDF

92.0 KB Created: 2021-05-29 13:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2dd3d323f9c87373e0377ac6bd8029b8 SHA-1: f30b181dc1cd247f7db82484c49056ad08d81811 SHA-256: e33d8ac6026b2280e988ba43bd6004134567c9f836b7e07294590870bb1411b5
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 0.9926

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://crophysi.ru/123?utm_term=monocot+vs+dicot+worksheet+pdf PDF link annotation
    • https://zonepebitebebo.weebly.com/uploads/1/3/4/3/134369254/6274224.pdfIn PDF document text
    • https://pasazobunev.weebly.com/uploads/1/3/4/6/134670772/xajavixomi.pdfIn PDF document text
    • https://korisupugi.weebly.com/uploads/1/3/5/3/135308649/zobupolobixixuvej.pdfIn PDF document text
    • https://lenoloxib.weebly.com/uploads/1/3/4/0/134040664/gomebojifof.pdfIn PDF document text
    • https://gewewipuno.weebly.com/uploads/1/3/0/7/130775766/basitubisevorad-lozib-jawekupup-ginegekab.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/49a29e7fc59.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/e7f62d907d3.pdfIn PDF document text
    • https://jadibezunapav.weebly.com/uploads/1/3/4/6/134610372/583a92a.pdfIn PDF document text
    • https://ruzuxopamekegi.weebly.com/uploads/1/3/4/7/134748505/2865740.pdfIn PDF document text
    • https://nesaresivegixan.weebly.com/uploads/1/3/1/4/131453215/2949060.pdfIn PDF document text
    • https://juwopumunas.weebly.com/uploads/1/3/4/0/134096214/zotinu.pdfIn PDF document text
    • https://kusajigoma.weebly.com/uploads/1/3/6/0/136036420/2781902.pdfIn PDF document text
    • https://bozetefaz.weebly.com/uploads/1/3/4/7/134733050/turirabaxote.pdfIn PDF document text
    • https://jupawipomilat.weebly.com/uploads/1/3/2/7/132741176/rigugeraxora.pdfIn PDF document text
    • https://lesakotuvolev.weebly.com/uploads/1/3/7/5/137505649/9165412.pdfIn PDF document text
    • https://wedisojurul.weebly.com/uploads/1/3/4/5/134515344/81faf9.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/ratupapob-pajupezofi-jubekof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/80ce6bd3-c095-463e-8d20-4228f2d9b722/how_to_update_my_garmin_astro_220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6b3c60-04eb-43b4-aa87-dba932b63307/mipukifarofofad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e6d148b-a503-4793-9680-0085e4d7a1d0/wemubibukezenuzan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/750de45d-f320-474c-b63f-2a1178738402/fuzamujusekudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ceead0a-dce8-4be2-a862-7e1b069f4560/pivasatesezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5785560b-4070-4d20-a7c8-400999d8a175/plantronics_voyager_pro_hd_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717a8a4d-79c1-4391-b2e2-67614c11ae0c/wrong_turn_4_full_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bb2e6b6-62e2-452c-9707-ba6388ebda20/88452523691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613094df-503b-4490-b6a0-36d5eda2dd53/91672180597.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 2828 bytes
SHA-256: 4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9
font_01_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 5012 bytes
SHA-256: ddcc0ce9f4764bcc54375d54445d3f1afbc1595b8ad071ced814b2d0dd061196
font_02_sfnt_off00012ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 10144 bytes
SHA-256: b3530ee3c565f1b04caffe15c412471db08bee0c183fa341d0db20d9ed2a3b5e
font_03_sfnt_off00015186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15186 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2