Malicious PDF — malware analysis report

Static analysis result for SHA-256 b116af231959261d…

MALICIOUS

PDF

70.8 KB Created: 2021-03-19 08:33:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f904f112b18cad1cbf92b1c7b1fb0bfe SHA-1: 3013bfc101c6884f28bba247eb6d0f5611de80d9 SHA-256: b116af231959261dd2cc49185c7d0788b17857ad4b1510ec4df6a1c11ce8d310
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various URLs. One of these URLs, https://kuzutuzo.ru/award?keyword=cascais+map+pdf, is directly embedded and suggests a lure related to a map or award. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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=cascais+map+pdf PDF link annotation
    • https://cdn.sqhk.co/pemazekefise/aghZXhg/trouble_download_spider_man_ps4_dlc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zufutetuwume/Hgiggyf/csr_classics_hack_download.pdfIn PDF document text
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/ripemejalegika-wuxok-kugowaxizeno-zasogumelin.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/GdAhbjc/zuvukukesudup.pdfIn PDF document text
    • https://cdn.sqhk.co/fejukomus/N3QVLgc/personal_stickers_apkpure.pdfIn PDF document text
    • https://goxapixexaze.weebly.com/uploads/1/3/1/6/131607486/fejijoxumutud.pdfIn PDF document text
    • https://vekowafonomi.weebly.com/uploads/1/3/4/6/134692424/9113838.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/gupodi-kukudoke-mifobut-papadinet.pdfIn PDF document text
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/tedozad-xexeveli-zanewufa.pdfIn PDF document text
    • https://sazadasixitabe.weebly.com/uploads/1/3/4/4/134404720/mavizu.pdfIn PDF document text
    • https://jedumetunu.weebly.com/uploads/1/3/5/3/135388943/dibopisimik.pdfIn PDF document text
    • https://pulisojoperun.weebly.com/uploads/1/3/4/4/134487891/lanowige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bodajaku/vakasufebaxitebekezixipim.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/audio_cutter_and_joiner_pro_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1858fb-2eeb-4487-abd7-ec4554640a8b/18731216810.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/59455023817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f5004df-9691-4e7f-965d-5675f3c28968/who_is_rich_dad_poor_dad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de0e4b3-ca52-41fa-931d-75bf7f39b2e8/describe_how_you_would_demonstrate_that_photosynthesis_has_taken_place_in_the_leaves_of_a_plant.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_503f50fdacb6472db5b3ec69eb6d13b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8744bfa0-bc02-446f-b667-57beb8b1cdfc/swisher_mowers_zero_turn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37809769-1c6c-42bb-8aac-2124c1573158/what_is_4e-4.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_e8a3613e3c25468eb15e6d7d6af46350.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/jizekuxavaveliwav.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 5080 bytes
SHA-256: 0c9aafe3278d00a096a2372a4d47ed30cbed259818a1fe0bd5cf85bf0f804252
font_01_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 10648 bytes
SHA-256: 029579aeac74ab209b5fe0a9a8059feeac1e554fc3dd30319cfa26815c759a80