Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22aaee7c7a1b6ff…

MALICIOUS

PDF

82.5 KB Created: 2021-05-30 04:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0990957d9c9d2f2e7725e5266a63180f SHA-1: 09f5b410bf1a4880b313ff5a9e45a31a003f8e6e SHA-256: a22aaee7c7a1b6ff010836c40d52a7fedd188effac8799db00e2662e0a22941b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary URL observed is https://xezojetit.ru/strik, which is likely part of a phishing or malware distribution scheme.

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://xezojetit.ru/strik?utm_term=el+caballo+de+troya+pdf+descargar PDF link annotation
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/tikanibimewebufisa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5ffffebb37f24.pdfIn PDF document text
    • https://fodolirikixubug.weebly.com/uploads/1/3/5/2/135297927/196425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471488/normal_5fdc8747e23c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406501/normal_6008e1ed74f0e.pdfIn PDF document text
    • https://lexaxaverewazud.weebly.com/uploads/1/3/1/3/131381910/5871186.pdfIn PDF document text
    • https://tafebitekule.weebly.com/uploads/1/3/0/7/130776603/sixupelid.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481280/normal_60b289613fb0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5fce47863f94c.pdfIn PDF document text
    • https://fubapisa.weebly.com/uploads/1/3/1/4/131406294/7005160.pdfIn PDF document text
    • https://lefokanu.weebly.com/uploads/1/3/4/3/134377273/gedulasafudazo-limufexatexe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5fd0927ec5a47.pdfIn PDF document text
    • https://zatafepe.weebly.com/uploads/1/3/4/0/134000007/zevidosofifezuz-duwagadonopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462354/normal_600fa39d4c797.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/bbec0235-e172-47fe-89a9-a998221c7d6e/how_to_pair_plantronics_headset_c054a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de87582-61a5-44ae-a6e9-3be619ae2297/ridow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4380ed89-bccd-4d17-9651-a824971862b5/how_to_charge_rca_tablet_without_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7281dae0-9939-43a4-90c5-732117bfd246/wajokawezajozuveke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8566f761-d44c-48f7-866b-ef1471ee9ecc/hanging_plants_autocad_blocks_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d46229-2d2f-4dc1-aeb2-4afa51d3728c/how_to_pass_az_permit_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2795a1-600b-46f4-bb8a-baea1c747118/wabagifimepesu.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_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 5520 bytes
SHA-256: 208058e36e35221c22fae688ffa63afb0b7089bafb606bbbe2c6bb403bd0323e
font_01_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 11332 bytes
SHA-256: 42e202f22b4c7ce1ad0d16851ef37345c550912c207a77e17304787baf2fd46e
font_02_sfnt_off0001258e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258E 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140