Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f07e689581b26f6…

MALICIOUS

PDF

81.8 KB Created: 2021-02-19 11:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e804d65dfc325e41d58916fd5c36af49 SHA-1: c26a4db4a2a58eb19d696f24c1c75c62bc098344 SHA-256: 8f07e689581b26f675b236eb3a87345aae4e8866b8d4f205ec1b8f0c75869838
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/123?utm_term=browning+a500+disassembly PDF link annotation
    • https://cdn.sqhk.co/mezutowede/MsiaQUt/tuvavonezujalofezujelu.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/jjGgf6A/guess_the_wwe_superstar_by_their_theme_song.pdfIn PDF document text
    • https://cdn.sqhk.co/vomoxixeri/gfQighj/sling_blade_movie_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/kidimezamos/xlkhcv4/pacific_fire_and_security_systems.pdfIn PDF document text
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/zepotejapareliw.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/gd6Ynij/android_cross_wallpaper_apps.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/0e51d3d6716.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/tiejhid/gizipigidazegamatopuwugek.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/XjTdheJ/96045385556.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/6TSUvge/bombsquadkittens_destiny_2.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/d7aaece9b9ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dukizovisepo.rf.gd/school_rules_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/78513682482.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/afaan_oromo_film_free.pdfIn PDF document text
    • http://livufuxe.epizy.com/jepekivovilunenivixo.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/animal_crossing_gc_bug_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/4993858817.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/bumije.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_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 5796 bytes
SHA-256: 824efbc56558b9ab63c5fdf1c69373bcbd170acf8000e773aa0e3bec61af7cc6
font_01_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 10476 bytes
SHA-256: 04c7aff1bfb77eb9375cdacd8808a79981045d38ff7634f6487004a7ea81ba8f

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