Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3a7a6b2902fad1…

MALICIOUS

PDF

71.3 KB Created: 2021-02-06 17:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 823f47397b638888c1857fe02b695dd2 SHA-1: c4cf2ec32ff18442a2d0b63afacab72a859a4ad1 SHA-256: af3a7a6b2902fad1fdfd3eea142fbe6bcb22ef78a49d6d0e6f2c9f4f15d77e9f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to other PDF files, many hosted on disposable domains. This suggests a tactic to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://druttle.ru/123?utm_term=three+sisters+springs PDF link annotation
    • https://cdn.sqhk.co/jevipugirofi/NlBiaxP/weekly_specials_near_me_restaurant.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/e3geha8/cute_wallpapers_for_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/rowubuvuke/ihLpicR/minetest_give_commands.pdfIn PDF document text
    • http://copyright-central-media.com/bureaucracy_in_sociologyz5f4a.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/jggjif1/dakonil.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/7cCGhdZ/gajisabaxubipodipab.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/iiXibgg/geometry_dash_subzero_mod_apk_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/dEtYhbh/dodge_city_tournament_of_champions_2020_bracket.pdfIn PDF document text
    • https://bigubiforuse.weebly.com/uploads/1/3/5/3/135389938/puvogasu.pdfIn PDF document text
    • http://ca-management.website/nesekejirujuzv5yd0.pdfIn PDF document text
    • http://yandex-delivery.cc/iphone_x_ringtone_remix_download_mp3hf0p3.pdfIn PDF document text
    • https://cdn.sqhk.co/keliziniw/cwVhaS4/78693484445.pdfIn PDF document text
    • https://varusotefus.weebly.com/uploads/1/3/1/3/131398431/badefewu.pdfIn PDF document text
    • http://neo-tp.ru/acquisitions_incorporated_onlinexx5uv.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/fG0Ex61/amazon_seller_customer_service_us.pdfIn PDF document text
    • http://nukels.xyz/2960328844490pp1.pdfIn PDF document text
    • https://cdn.sqhk.co/lakisitu/fgfgfgi/animal_road_warriors_wwe.pdfIn PDF document text
    • http://fitdieta.com/game_maker_studio_2d_androidnf3qz.pdfIn PDF document text
    • http://trastenmyqort.online/maryland_drivers_manual_spanishil4hy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 4788 bytes
SHA-256: 2d7dbfc6c1655d5eb1c0f85255987a37328c617dc4b54364ae63f60689de3676
font_01_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 11072 bytes
SHA-256: 74387c4b459da78c38c88f9e211fc870ebab866a154cc371fa823060cef8b754

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