Malicious PDF — malware analysis report

Static analysis result for SHA-256 43211322757f816b…

MALICIOUS

PDF

73.0 KB Created: 2021-02-12 06:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9d985f0d3729ec0d9c4a9f60c5e08c98 SHA-1: 86dbb32be142a19e1c1a9c9d978ada418ad532a5 SHA-256: 43211322757f816bc00a5d62f3677e198ee003f9873b6e228ecd63c724ccc0fc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a site offering a 'free training certificate template', a common lure for phishing or malware delivery. The PDF structure also suggests it's a link farm designed to redirect users to various external sites.

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://leonvi.ru/wb?keyword=modele%20attestation%20de%20fin%20de%20formation%20gratuit PDF link annotation
    • http://therarbooks.com/5218630984ozo53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389820/normal_5fe2b7e8c4f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_600a738b27c3c.pdfIn PDF document text
    • http://mignonette.space/distosia_jalan_lahir06ki3.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/haMgjha/nugixavikogenatave.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotonolo/9hafgcv/74104589589.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/jjd8rje/guide_for_forza_street_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/Y6jfkha/33835806575.pdfIn PDF document text
    • http://begemotiks.fun/bike_wheel_size_age_guidexru7z.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/iSNLje1/amazing_thief_in_hollywood_full_movie_free.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/kRgfCPF/onedrive_login_error_0x8004de25.pdfIn PDF document text
    • http://servempieza.site/laxokobu8ajpm.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/jfDmjLP/fakukisenunipowudosuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gawabog/kangayam_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/android_alarmmanager_start_service_example.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/bootstrap_3_cards_template.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_off0000dc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 5232 bytes
SHA-256: eaa3640288e387ca039158684af1a5c44c1a319a8425e82e233dd5b172e76a36
font_01_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 12156 bytes
SHA-256: 7d9d201f3648c221c4a00442adab53c32ccd9115610720cfdde6652cf2768611

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