Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa88f970dbf46ea6…

MALICIOUS

PDF

73.1 KB Created: 2021-03-28 07:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 82b94340ed131c7c5c5a275852226ce5 SHA-1: 59a5faa59ab32d571fb1a2a0d478a1fba0b9ee4e SHA-256: fa88f970dbf46ea634233e99ec962c690b39bcf474fcbf1035f3e0f93e9a45d9
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' lure further supports a phishing or malware distribution scenario, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/123?utm_term=microsoft+sql+server+2017+enterprise+edition In PDF document text
    • http://bahis-sikayet.com/55589599152bjwcg.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/ifqVtid/collection_movie_dvd_covers_to_print_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/Qgjjeie/vocal_cords_function.pdfIn PDF document text
    • http://sarhello.online/what_genre_is_false_god_by_taylor_swiftgc2cw.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/6yie8RC/kubuvu.pdfIn PDF document text
    • http://libertinemodels.com/most_played_games_2018_androidc8qhw.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/hjZUFgd/girl_baby_shower_games_with_answers.pdfIn PDF document text
    • http://esplus.pro/329638939405fldk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mebupeb.rf.gd/how_to_use_fender_frontman_10g.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/75333262625.pdfIn PDF document text
    • http://sevidimifab.epizy.com/13864202289.pdfIn PDF document text
    • http://lavavil.rf.gd/benaf.pdfIn PDF document text
    • http://vodukatova.epizy.com/cheapest_double_bed_sheets_online.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/what_oil_does_a_2015_dodge_durango_take.pdfIn PDF document text
    • http://viduzakovovamu.rf.gd/angularjs_2._0_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/product_rule_to_multiply_square_roots.pdfIn PDF document text
    • http://tibobabinenan.epizy.com/10975510857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d66ede-baa0-4de8-a635-4a03dd433194/is_samsung_a10_camera_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b045fd1-b599-4ef4-84a4-b5f0dedb868d/used_ranger_boat_covers_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199e9762-82bb-4c6d-a445-48409b6528d2/68628524731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a51909-3379-4702-aa8e-b86b2d20600b/cyberpower_1500pfclcd_software.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_off0000d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33A 5324 bytes
SHA-256: c971f2d65ee27128d1503fb53ffe911428a77a5bcc41fda5fbc5a39cfe478b5f
font_01_sfnt_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 10444 bytes
SHA-256: e287b955a4b5416be6c0b1ab4df7ce41d53d5a085fd1cb0183de20a69423f5d9
font_02_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2