Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f43a1a33d54bf7d…

MALICIOUS

PDF

72.9 KB Created: 2021-03-12 17:17:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 82737626c33354763c554878698fac92 SHA-1: 99b9a02b12c2f2a13d99f44860b6f295414d6a33 SHA-256: 9f43a1a33d54bf7d12a74bc20edda9bdadf85ac4ee2428b7e3da2b8e8575cb89
184 Risk Score

Malware Insights

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

The PDF contains multiple links, with one specifically identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Ayn Rand Anthem PDF free download', suggesting a lure to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://yafferge.ru/award?keyword=ayn+rand+anthem+pdf+free+download In PDF document text
    • https://lotekovikerux.weebly.com/uploads/1/3/1/3/131398560/gufinu.pdfIn PDF document text
    • https://gifukupuwabe.weebly.com/uploads/1/3/0/7/130775529/zotok-godejotozoliwo-fudidawimowuza.pdfIn PDF document text
    • http://dipazekonowa.mypressonline.com/bohemian_rhapsody_fingerstyle_tab.pdfIn PDF document text
    • http://roselosudeve.sportsontheweb.net/soberoxuxoj.pdfIn PDF document text
    • https://kunugamonigosa.weebly.com/uploads/1/3/1/8/131871761/kipudap-rifevuta.pdfIn PDF document text
    • http://karulapox.iblogger.org/57404491540.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/bill_james_baseball_abstract_1987.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/c3eb5180-476d-4d92-87ff-8076fad5c17d/zoom_cable_modem_5341j_lights.pdfIn PDF document text
    • http://vejebuta.rf.gd/gta_v_redux_mod_installation_guide.pdfIn PDF document text
    • http://fepenupusabumo.rf.gd/los_actos_humanos.pdfIn PDF document text
    • http://rowavironipomiz.epizy.com/bhojpuri_dj_video_song_2015.pdfIn PDF document text
    • http://loxezenot.epizy.com/88392401672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da25056-a2cd-49a6-8f79-97347d7ae01e/jfk_inaugural_address_tone.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/74472718040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd5ffc9-1de0-4270-ab1b-ee650649ad16/ruwuninujaz.pdfIn PDF document text
    • http://susugafof.epizy.com/lusasup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d752bcd7-01e8-47e0-9d43-ffed02664f58/the_other_side_of_heaven_2001_izle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47603d55-427a-4015-be7b-de73bfa685f7/19153958094.pdfIn PDF document text
    • http://dovanokeji.epizy.com/how_to_read_lipid_profile_report.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/the_bullet_journal_method_ryder_carroll_download.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_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 5288 bytes
SHA-256: 7b533593529ea8dd7f715d03500bccbb153f997c42f635a6e0a552622b00894b
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 10504 bytes
SHA-256: 2f3e4aaaae5b3f60b3266c1271b68abb0e225d96d9afc170947ebdc97444e97b

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