Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf900c7a48e72e2…

MALICIOUS

PDF

75.7 KB Created: 2021-02-19 03:39:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f0a048087dc1b7364dd18a625377ac4a SHA-1: aeb550a6d5ddc79b59cbde25400588e34a1b7c76 SHA-256: cdf900c7a48e72e2e48bdd6e6c73b3bb911b85685564b5814254f4da5ccd4eb6
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/wix?keyword=motorola+mt350r+battery PDF link annotation
    • https://cdn.sqhk.co/gepeduvo/bjbjaEO/vepololabijofifaj.pdfIn PDF document text
    • http://braco.ru/penyakit_sistem_pencernaan_manusiaxgxak.pdfIn PDF document text
    • http://pimazisiperej.iblogger.org/32034406587.pdfIn PDF document text
    • http://tk-time.site/gogujadajusawisakamanujiwj1a8p.pdfIn PDF document text
    • http://winsbig.space/xenuwizosidpq71.pdfIn PDF document text
    • http://lazerepil.site/89438240885i81hx.pdfIn PDF document text
    • http://ilkertr.shop/jarawepuwiboduv1zli9.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/v4DKibP/lexumazevoxabajolu.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/idiiIji/gebireninezegavexukisar.pdfIn PDF document text
    • http://autokenn.com/weather_report_for_charles_town_wv0u6xk.pdfIn PDF document text
    • https://cdn.sqhk.co/daguvemet/cEhip7T/61682853268.pdfIn PDF document text
    • https://cdn.sqhk.co/tozijizubu/hfABNge/12306869599.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenilu/pijghjh/49166689667.pdfIn PDF document text
    • https://cdn.sqhk.co/xagunetoxa/jijhfmz/baseball_trading_card_shops_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/D6gcSo5/dragon_city_breeding_heroic_2020.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/2323884111190cao.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/gdgcgcK/toca_hair_salon_3_free_download_pc.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/fulosobezur/jeep_cherokee_2014_owners_manual.pdfIn PDF document text
    • http://sukasorepej.rf.gd/89163841945.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/striper_fishing_report_cape_cod.pdfIn PDF document text
    • http://verejepaw.epizy.com/game_killer_apk_no_root_2018.pdfIn PDF document text
    • http://sidovarodefomi.rf.gd/combining_data_from_multiple_sheets_into_one.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
    • 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_off0000d1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BA 5328 bytes
SHA-256: 94980e2cfbc2780898f906286f347fb91874fa35746be40152b897dae71eac6d
font_01_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 10632 bytes
SHA-256: 07a7ff0fc0d10deeb2f4bf78534f6a0fc06d20244f9da635c7ad2f8711497efa
font_02_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 17380 bytes
SHA-256: 857aa92d6017c34f21c9443ff8a34024e89bb4682195af61bcc89acef82ca2f9

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