Malicious PDF — malware analysis report

Static analysis result for SHA-256 03936e99b08d0a01…

MALICIOUS

PDF

72.9 KB Created: 2021-06-09 19:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2c151ab3f7bcab355f3b1743ef47c26e SHA-1: 263627bb69b0e274a441d41ffaae96af89c69be4 SHA-256: 03936e99b08d0a01e4598c32962bbb3e2055e23d0648b3fa6e7d0ee3edc3c132
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 0.9990

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=how+to+find+gps+coordinates+on+iphone PDF link annotation
    • https://jazabibukunete.weebly.com/uploads/1/3/5/9/135962119/3111570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501501/normal_605f5b20baad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_605a93e4b9098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_6051c0b62df48.pdfIn PDF document text
    • https://wevejabunom.weebly.com/uploads/1/3/1/4/131406075/8bc7c87.pdfIn PDF document text
    • https://kimexigute.weebly.com/uploads/1/3/4/0/134017587/3798625.pdfIn PDF document text
    • https://vivesajepud.weebly.com/uploads/1/3/0/9/130969004/xogip.pdfIn PDF document text
    • https://dogamoduxex.weebly.com/uploads/1/3/4/4/134481485/6711764.pdfIn PDF document text
    • https://mituzeru.weebly.com/uploads/1/3/2/6/132681412/dukudurorexevo-nomejejat-dujapisevimon-logexodewigor.pdfIn PDF document text
    • https://losikopak.weebly.com/uploads/1/3/4/6/134616488/2641375.pdfIn PDF document text
    • https://dalideno.weebly.com/uploads/1/3/5/3/135384103/furazuwopujuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450350/normal_5fd0ba15f3cf9.pdfIn PDF document text
    • https://zofoneparadi.weebly.com/uploads/1/3/5/3/135341866/noxazuruwa-mugidapaf-xololeluguma-belerivipabus.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/7d695c08-004e-42aa-8750-e3ff83bbb37d/fusubodifazito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d5087c-ea91-463e-903b-4b18f6db2f96/can_should_must_exercises_1_eso.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/f/buddy_toss_hack_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73bcc62f-f413-4c94-b0ba-0db041c7e9a7/rafupegotewikuvevev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2df02b6-b88e-4745-a75f-af32a0c5c660/graco_milestone_convertible_car_seat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c497babf-964b-42d7-ae9e-f45ec5cf6085/90s_dance_house_music_playlist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc96c49a-ff20-4624-a13d-58644a170e54/77859628067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f34d8dc3-5184-46ab-89d3-f84b05a27e7b/how_to_do_chart_division_sums.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf9f812-7af8-4712-9d22-831744b41d55/tozo_t6_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff41fa41-ef0e-4015-be6c-564049e99f8c/36119756538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34ddb72-37b6-42f0-94bc-c89861e2ec07/resident_evil_4_ppsspp_cso_file_download.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/81405116754.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_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 5440 bytes
SHA-256: f3f65471318bf85736069873977c20b739ad9934190cf9b9f977704c6a763ebd
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 10488 bytes
SHA-256: eb6d5e41f6c437e3afffffe089e9b16f81c544792663e0d4911779df8dca0985