Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ddf5349102a8a6d…

MALICIOUS

PDF

86.3 KB Created: 2021-06-06 00:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a6da3e9160122618e34b2076a7973876 SHA-1: 101132d4463e2fd42b0378f5f8a78a1ab43b27d4 SHA-256: 2ddf5349102a8a6d4902d8bc1d685f964fec1256473dc1fbdeba8afdf481afbe
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 0.9996

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://krisoc.ru/pbw?utm_term=incredible+english+2+teacher%2527s+book+pdf+download PDF link annotation
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/ad06e8ed1640d81.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/6953641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5fdbc603b01b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_600ffa07aa40f.pdfIn PDF document text
    • https://welukixavise.weebly.com/uploads/1/3/1/0/131069839/1b2bcdef3c252a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410211/normal_600ea1c1b9d37.pdfIn PDF document text
    • https://paxolobiwoke.weebly.com/uploads/1/3/1/1/131163878/bujobaguninupu_pudofixejunuzed_kologimobik.pdfIn PDF document text
    • https://wadidomewagu.weebly.com/uploads/1/3/2/6/132681938/2134b8bac.pdfIn PDF document text
    • https://ziwarafe.weebly.com/uploads/1/3/4/3/134306838/maxip.pdfIn PDF document text
    • https://pumurepuwalor.weebly.com/uploads/1/3/5/9/135978845/f0c898cb4cdbe9.pdfIn PDF document text
    • https://tegupovo.weebly.com/uploads/1/3/0/7/130775278/4527414.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/83199f92-8169-4fef-9c3d-b2a61473f855/pamelipasijope.pdfIn PDF document text
    • http://kizisoj.pbworks.com/f/sniper_3d_assassin_pvp_arena_cheats.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144527823/19569915049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee431950-a6c3-42cc-9f8f-ef771b553200/febuxutanat.pdfIn PDF document text
    • http://gepefupugalu.pbworks.com/w/file/fetch/144686355/how_to_fix_something_went_wrong.pdfIn PDF document text
    • http://moxulolo.pbworks.com/f/how_big_is_a_13_inch_laptop_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/678e4be5-3d3e-4342-a148-4224309dcc2a/how_to_improve_your_communication_style.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144420216/cuentos_cortos_de_aventuras_para_nios_de_secundaria.pdfIn PDF document text
    • http://laxaxufudej.pbworks.com/w/file/fetch/144510000/hungry_shark_evolution_unlimited_money_v2.0.0_mod_apk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 3464 bytes
SHA-256: 6307c868ad8d5e4d4b28b62237a4f98ea2ccc1e78ef92407ea21be513ef62f30
font_01_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 5816 bytes
SHA-256: ce452093cbef8f71c8c734748b1a4931591a7b66de02cc015e766aee2be7f991
font_02_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 17448 bytes
SHA-256: 52a3e50c1488b6df83815a433393aab48b8a5e6258f803f12d1c8e341a04a496
font_03_sfnt_off00013355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13355 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939