Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f73ab883d81eba3…

MALICIOUS

PDF

93.4 KB Created: 2021-03-04 16:33:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1399bc589343ebbbf6aa1b2cbc6818f1 SHA-1: c26b52d4af0b74a22baa83e714c54d58f194e1dc SHA-256: 0f73ab883d81eba39795af8094131e9393b86b72533a53e3c80a64c4d12fc469
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. ClamAV and an ML classifier identified this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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 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://dugedepap.ru/award?keyword=general+data+protection+regulation+%2528gdpr%2529+2018+pdf PDF link annotation
    • http://usacreditscore.info/kotubuwee09j8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495558/normal_5ff654a4e4ae6.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/e1jdDji/35418833053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469847/normal_601da3327e71e.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/xiczifZ/97913528344.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/gcgiTYG/doll_pixel_art_color_by_number_unblocked.pdfIn PDF document text
    • http://liolika-rsya.ru/85265860921mucg8.pdfIn PDF document text
    • https://cdn.sqhk.co/vutenugade/Vicjaje/video_live_wallpaper_iphone_x.pdfIn PDF document text
    • https://cdn.sqhk.co/bomunerafoju/gkMjbgg/live_video_of_moon_today.pdfIn PDF document text
    • http://jopkapopka.online/zopozonuhii5p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370547/normal_5ff80abee0d83.pdfIn PDF document text
    • https://jolejijiwunepa.weebly.com/uploads/1/3/5/3/135334118/987489a4.pdfIn PDF document text
    • http://housefashion.ru/advanced_unix_commands_cheat_sheetq4gg9.pdfIn PDF document text
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/lofasoretub_lojoxezosig_sesun_gonab.pdfIn PDF document text
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/segowaxoje.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/81b6a2a.pdfIn PDF document text
    • https://zumaboletafu.weebly.com/uploads/1/3/1/4/131454272/nalotafo_govil_biwegusivebike_zefefomulajuw.pdfIn PDF document text
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/razeratobovumuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_6030428e209ce.pdfIn PDF document text
    • https://nebomigefut.weebly.com/uploads/1/3/4/3/134359696/6624421.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/b07b27c0-5e3f-4109-93ae-2ce43076a760/sewitulixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f3681ce-c989-4f4b-8fe7-74e8f57b08da/sokezoxob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ea25d6-cf83-41f1-86e4-6675f7a0c72a/14746018985.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 1876 bytes
SHA-256: c90e0e4a79ceffe808cf46746c0998807964ce8b8740714596128e6a9b291969
font_01_sfnt_off00012e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E78 5852 bytes
SHA-256: 411928ab76499f67c4a688839ef5a3a66fe294c888c607e46be135ca9c9f6f30
font_02_sfnt_off0001428f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428F 10576 bytes
SHA-256: a7b71a93cb13ad60c2aa6cb79198808556974814f1ef8f761fb263a1205d4f7c