Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca3a1b0351c8902…

MALICIOUS

PDF

75.3 KB Created: 2021-03-24 04:35:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 30210407710f8837cdbafbad61684d8f SHA-1: 86758c94108ccff5f75387464dd83cd625e7754e SHA-256: 8ca3a1b0351c8902b8aa41067cf136e520c4c3e3ae50578c48e60917df4b39b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://botokaw.ru/strik?utm_term=48+laws+of+power+pdf PDF link annotation
    • https://zumaraje.weebly.com/uploads/1/3/0/7/130776401/5381797.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/Eqhjkjd/94878622504.pdfIn PDF document text
    • https://cdn.sqhk.co/gegatuzikat/JnyFGjd/subway_vinaigrette_sauce.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/6115340.pdfIn PDF document text
    • http://tirudibemaj.22web.org/bharat_ane_nenu_cinema_songs.pdfIn PDF document text
    • http://kesimaseduwedob.22web.org/liwomevurajubudedofesod.pdfIn PDF document text
    • https://jokasagumejede.weebly.com/uploads/1/3/1/0/131070006/xavewogaxejojoj.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/33a5eb2cfc6f1f5.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/hbgcXg2/40156978523.pdfIn PDF document text
    • http://jumovuv.22web.org/good_morning_photos_wallpaper_cave.pdfIn PDF document text
    • https://cdn.sqhk.co/fokaladanolo/cicnqjh/factoring_completely_worksheet_algebra_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tadekisez.epizy.com/34460171776.pdfIn PDF document text
    • http://tagajupagaloni.epizy.com/parasitic_diseases_of_poultry.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/cavani_jacket_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/wabipovewi.pdfIn PDF document text
    • http://rabuwupitakif.rf.gd/badlapur_full_movie_480p_worldfree4u.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/rabazas.pdfIn PDF document text
    • http://nakafase.epizy.com/wine_powerpoint_presentation_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/61095769480.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_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 5312 bytes
SHA-256: 24033fa29f618a18729b1423e3b9c9287af73de5bcacb36826f629cb2df11a1e
font_01_sfnt_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 10840 bytes
SHA-256: c8a66203734b8716524ed1e1a26e5b72df5afa41c7eca1cd1147e8c601c870da