Malicious PDF — malware analysis report

Static analysis result for SHA-256 999fef8cab8590b7…

MALICIOUS

PDF

145.5 KB Created: 2021-03-25 16:57:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f3f23e8ae3bac5985f96a7bb86f87ff4 SHA-1: 9a7d110c25f3ccd88146b688983304305fe5a1db SHA-256: 999fef8cab8590b7a9d8e9e6bfbe011e6770d5fe4ee7e2d87dc63ddbc5447825
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9965

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://kuzutuzo.ru/award?keyword=asansol+to+burdwan+local+train+time+table+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422884/normal_5fe502e8e0c7b.pdfIn PDF document text
    • https://cdn.sqhk.co/mixenezir/agiw2Ro/bromelina_propiedades.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/hji9hcV/4479893951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403410/normal_601617bba049b.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/fIjgOgc/tiwubusosoxofakedod.pdfIn PDF document text
    • http://surisetufuna.iblogger.org/maths_solver_app_free.pdfIn PDF document text
    • https://cdn.sqhk.co/ziratede/aigWjhA/call_of_duty_legends_apkpure.pdfIn PDF document text
    • http://gumovuf.22web.org/tuzokotenererulijopawile.pdfIn PDF document text
    • https://cdn.sqhk.co/biposuba/OiiMiaB/29813199414.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454966/normal_60010b3ef3b2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384154/normal_5ff2119b7e017.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://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_7e8680b1d4d145aeb6f628dc55c0b739.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_90d713b713734a048426b6cef49f812a.pdf?index=trueIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_d75ae22fe0424f91b6bb355fa9401d58.pdf?index=trueIn PDF document text
    • http://wevosana.rf.gd/vezomomijatok.pdfIn PDF document text
    • http://datifuvuk.epizy.com/94730471719.pdfIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_9728c0cb71174f73a7ef7be86f1b46aa.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_c484885e224941738ebe6ad3c4791888.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_a2ae00d3a47943b18b20b02ab9da4486.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_61990522aa2c4fc9837c787725c16fcb.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_e3609a512c984f269cc96872b20c910d.pdf?index=trueIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7D7 5520 bytes
SHA-256: fcac793badc13d5da30b4787c15acbd01cd34bef16b88aa5f5b30c5ad2bc97bc
font_01_sfnt_off0001ca8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA8E 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0001d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5F2 11072 bytes
SHA-256: 916ca1f10b9fac38af5782c1c18ec21423b2207820d49fa6dc3bb55858f330b7
font_03_sfnt_off0001fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC3A 16400 bytes
SHA-256: a6a57726029a27662a7224bc69fb17ee954176c9a28c16d3cf0251c9581bd845
font_04_sfnt_off000212a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212A3 10916 bytes
SHA-256: 5ba7b99013f53e832d23d5727f8294f51c2963acfa159ab5d1da4a3bf0d59b48

Open this report in the interactive analyzer, or submit your own file for analysis.