Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad312656a307a4e7…

MALICIOUS

PDF

86.3 KB Created: 2021-06-12 09:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f5d4b300a751d8e55e23ce461273da4a SHA-1: c1658c145ff74e78e08d0f6d5c516afdd072d7a9 SHA-256: ad312656a307a4e725dbf876c12b1cb126343c160c64fedda5e0e6645fb41166
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 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/pbw?utm_term=cbse+class+12+biology+question+paper+2021+solved+pdf PDF link annotation
    • https://xexonuza.weebly.com/uploads/1/3/4/3/134305788/683ab046ec5c.pdfIn PDF document text
    • https://vebunigujop.weebly.com/uploads/1/3/4/3/134367951/5192405.pdfIn PDF document text
    • https://derewoju.weebly.com/uploads/1/3/4/3/134319287/pozosutufevusi-lusufuzoso-defipodefib-sefeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_6015b27b4b3fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_6054abb84b006.pdfIn PDF document text
    • https://pukaxixuzex.weebly.com/uploads/1/3/4/4/134492253/2816789.pdfIn PDF document text
    • https://nasakavagupudo.weebly.com/uploads/1/3/4/7/134766537/vomal.pdfIn PDF document text
    • https://guzozexuvuro.weebly.com/uploads/1/3/4/3/134322735/gukosijifuse.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/679601f73e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477181/normal_5fea169c4e8b3.pdfIn PDF document text
    • https://zusamazoboxo.weebly.com/uploads/1/3/4/5/134527389/a10968e929b1e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_601d934769dbb.pdfIn PDF document text
    • https://basurujilitafap.weebly.com/uploads/1/3/4/5/134595952/962517.pdfIn PDF document text
    • https://saxunada.weebly.com/uploads/1/3/4/8/134865385/tokilividuvop-kajozajovo-suwuridagifido.pdfIn PDF document text
    • https://wusulanapezuvu.weebly.com/uploads/1/3/4/3/134325740/9aa766.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/61580836-7773-404e-a72b-f89beb34aceb/mini_cooper_s_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3ffed7-de4e-480c-bb1a-77cb2b7f9eed/ejemplos_de_diagramas_de_flujo_para_algoritmos.pdfIn PDF document text
    • http://mituxap.pbworks.com/f/39446214261.pdfIn PDF document text
    • http://nefusim.pbworks.com/w/file/fetch/144729492/godarenegodagu.pdfIn PDF document text
    • http://nugewil.pbworks.com/w/file/fetch/144651201/notirudodubex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e1164a-521f-4577-8fbf-841928ba7ca1/taco_bell_grilled_cheese_burrito_carbs.pdfIn PDF document text
    • http://tinigogazos.pbworks.com/w/file/fetch/145097865/rumiwofuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7edacfc-f83f-4cd4-a942-5cc6311a2dc7/44039584485.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/f/poxewalanatavo.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_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 5980 bytes
SHA-256: 01cc63f8196d11424190f2af61f0b571eee746ee22e5ef1fd35faef07ad7e78b
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 10648 bytes
SHA-256: 61fbe3cee4bf26900643aa60abd66874ce126a11c900a83e7d6a74ebcfaf49fb
font_02_sfnt_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e
font_03_sfnt_off00013b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B70 3960 bytes
SHA-256: 0d1d2cb524a844f289cc69277be8a0001bcf6fb198a1ca01649d759716e28fca