Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8716c5ba280912…

MALICIOUS

PDF

111.3 KB Created: 2021-03-09 10:58:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf39b0ae178eea0d7b9284596e3849e7 SHA-1: 59d4ba605d8b37c00031a7929c14d341a1c92ae5 SHA-256: 5a8716c5ba280912e84e4092fade0ecc59a35aa9c261f751c021d1646c43ad01
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were extracted, the PDF structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/123?utm_term=beetle+crazy+cup+pc+game
    • http://talkme-news.info/blue_boy_and_purple_girl_hair3sbkl.pdf
    • http://slimerecipe.org/swann_surveillance_system_reviewssykl1.pdf
    • http://bonifacy.site/breather_in_transformertdwyq.pdf
    • http://nakidki-alkantara.xyz/audiomack_monetization_platformjzjim.pdf
    • https://cdn.sqhk.co/vudupapuj/gP8Wwus/font_awesome_4_file.pdf
    • http://septiki-rf.website/wshh_questions_episode_31ut28.pdf
    • https://cdn.sqhk.co/suxupijisajo/hAhbuV2/vemesexel.pdf
    • http://cg-designer.xyz/conservation_biogeographyqw63r.pdf
    • https://cdn-cms.f-static.net/uploads/4482618/normal_6041cace7c2b2.pdf
    • https://cdn.sqhk.co/nawakema/4tUhhfv/12159792668.pdf
    • https://cdn-cms.f-static.net/uploads/4374686/normal_6035a2a442db9.pdf
    • http://trylait.pro/67823998199wbhly.pdf
    • https://cdn-cms.f-static.net/uploads/4459166/normal_600fefb099fb0.pdf
    • https://static.s123-cdn-static.com/uploads/4446490/normal_5fc59fc281ae1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://modunozig.rf.gd/how_to_clean_ninja_auto_iq.pdf
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_5698244564f84c93a55cb83eaa9d78e4.pdf?index=true
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_9e7e07db58144c3cad37ab27087ee4c4.pdf?index=true
    • http://xofuzugavup.epizy.com/pokemon_adventure_red_walkthrough_celadon_city.pdf
    • http://didiwufujoloj.rf.gd/simple_comfort_2200_thermostat_wiring_diagram.pdf
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_9d0579d8d90649cf943b89a63e969289.pdf?index=true
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_f35c749fc3564807932d617c3e533f80.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001698e.bin
b2fd7534b7c86d3e959afa6d5845ee5602b52aac2b23c8f44861c3fb494b4b6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1698E 4892 bytes
font_01_sfnt_off00017a52.bin
93769d860f9a4e9641c2997c39bdbfc24f6c97e4655b5fd64474ce7d55f912d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A52 11836 bytes
font_02_sfnt_off0001a1fc.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1FC 4324 bytes

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