Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a918cf6a342b01…

MALICIOUS

PDF

87.6 KB Created: 2021-03-17 08:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 13790c4cd9c1b15fdc22f36088c0aa33 SHA-1: a0ebcdb627dbf6c57527ac9977c0c8deaf7024f2 SHA-256: d4a918cf6a342b012e25fe8447462a8409482c6eedf97f7043f932b7b65720fa
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a notable concentration on disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly support this attack pattern.

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 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://fokemale.ru/strik?utm_term=what+is+fiscal+federalism+ap+gov PDF link annotation
    • http://italywow.space/gamodubivelawit3o4ft.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384470/normal_5ffe0c213b56c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480884/normal_6051392d0d1b2.pdfIn PDF document text
    • http://vekvelo.ru/40632868127zfly.pdfIn PDF document text
    • http://kudretbozaci.com/garmin_vivofit_jr._2_-_marvel_spider-man_fitness_activity_tracker9e25w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419424/normal_600e4a032d1ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413228/normal_5fcc9cd0d7b8c.pdfIn PDF document text
    • http://milansit.space/xiruzafuwejikuwoykanm.pdfIn PDF document text
    • http://memisada.mygamesonline.org/76433861973.pdfIn PDF document text
    • http://pasendapp.online/zamogexesigaza0cmwq.pdfIn PDF document text
    • http://reabook.online/bipozerajiwelewe1g0i9.pdfIn PDF document text
    • http://women-ita.space/the_power_of_birthdays_stars_numbers_free_download37zek.pdfIn PDF document text
    • http://trokot-newshop.online/bugatagakupuxudawosojurat2pqro.pdfIn PDF document text
    • http://kungfumalibu.com/dewalt_dck240c2_drill_impact_driver_combo_kit8tdby.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/d4f06378-feb3-4c9e-bccb-4d4d90a60c2f/kuseduvitoxaxufenajab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d751d63-d85d-422f-a922-2a42c99d101c/the_giver_chapters_1-5_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb898db7-1168-4e8b-b7e2-bf0bff926337/how_to_set_up_element_smart_tv_without_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aef79bb-3d9c-47d5-9910-8353a1dab252/how_can_i_practice_mindful_breathing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52854dd3-66ac-4f0e-a2ec-9a009545d64a/zewitasuwemazijapinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf6b382-2a18-4084-a5fd-9a63310d6344/35546189648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ddca29-d57b-435c-8180-4b9d03df2e31/sulobutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fe5ba7d-450c-40bb-9c22-bc2bc2b3785d/acer_iconia_tab_a200_usb_port.pdfIn PDF document text
    • http://domuromu.atwebpages.com/how_much_does_a_round_bale_of_hay_weigh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8346cd3c-4e1e-41a0-a08f-5973d73beb2b/wolowupedali.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_off0001161a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161A 5644 bytes
SHA-256: 0102c3f85592ab17ecb8b76c7dd7334c32a4db4a659bf7ee50632aae2bf0d571
font_01_sfnt_off00012932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12932 11212 bytes
SHA-256: 9cbfb007c991b305c2c32bafabf0742ef52191aa1c7c4e4171f6503a3b049cb3