Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa106fc4ae2bb4f1…

MALICIOUS

PDF

76.1 KB Created: 2021-09-12 04:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0a8c220b84f7af7489c405360452043 SHA-1: 6b5e083ef9a5a46a1a4ac1640d2ce186062475ff SHA-256: aa106fc4ae2bb4f192506f28787a385973b091e0315f9f091a15fae04428d231
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many hosted on potentially disposable domains, suggest a link farm or phishing lure designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://beerskiboot.com/img/upload/file/83752819690.pdf In PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/linajiwozuwenulamuxeb.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/xudox.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/zelopira.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109031633248144.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/896327456.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/wosusidolebagolapatud.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/66412060376.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/fenexoworusokonu.pdfIn PDF document text
    • https://southafricapools.com/contents/files/ruvadivimanusux.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210907_EF4D02827346F4B9.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/54579681529.pdfIn PDF document text
    • http://www.heksan.com.pl/file/30561209252.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eeb101e32---81066196861.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/kojaxogo.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/608692612.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/divufodobetare.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/59951217559.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/kudofawavugitibegipa.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/kegisadesuwax.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/55228782323.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/kemekisasaxijumoxejadeg.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/lutaxi.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/73286915788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+way+to+run+android+apps+on+windows+10PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 10868 bytes
SHA-256: 6d05ef04d867ceaa8daac0d58025b3fb0ad07bbb2bc09e50498df896a2df20aa
font_02_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 16932 bytes
SHA-256: 291a9baab08cf11bee3c417cef311f328f359d68db8b41ecad334102a363b3fb

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