Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37b07b4e30d7e77…

MALICIOUS

PDF

76.6 KB Created: 2021-02-18 20:52:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1f33e36a82d15ee17b11b14c6225a019 SHA-1: 228214a8affe1e638ddb4bab449e2eead8f00b69 SHA-256: a37b07b4e30d7e7715d7739fc1e31f21a5e474b609410392770ebdc73366d4b6
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing for sensitive information or directing users to malicious sites. No scripts were extracted, but the presence of external URIs and the overall structure point towards a malicious document designed to trick users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=free+working+credit+cards+with+money+2020 PDF link annotation
    • http://vizionsmc.net/76571917926ypzuv.pdfIn PDF document text
    • http://usesoda.pro/dynamic_vs_static_character_worksheet64el1.pdfIn PDF document text
    • http://yandex-dostav.ru/87698107189hnzns.pdfIn PDF document text
    • http://nikecortez.net/jadizufexojetadomalq80.pdfIn PDF document text
    • http://nimolebefiv.22web.org/platform_number_14_ndls.pdfIn PDF document text
    • https://cdn.sqhk.co/mifimafonuku/yifgeAj/coin_master_free_spins_hack_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_602e9b27e3f35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483864/normal_6020750d9b207.pdfIn PDF document text
    • http://pedron.fun/download_photoshop_cs5_portable_jalantikusc9fkw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485927/normal_5fcc6fdf78084.pdfIn PDF document text
    • https://cdn.sqhk.co/norifasil/gibmBdb/nimidibesesirerifar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454684/normal_5ffbac6f9ea88.pdfIn PDF document text
    • http://springital.fun/cake_recipes_without_oven_malayalamw4uws.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/icRhhgd/the_wolf_chinese_drama_ending.pdfIn PDF document text
    • http://watertea.space/952641497456po2n.pdfIn PDF document text
    • http://kurs1.xyz/creed_2_workout_planhnsvv.pdfIn PDF document text
    • http://generatorsale.ru/wordpress_template_hierarchy_tutorialmpf07.pdfIn PDF document text
    • http://erogan-encolumbia.site/farming_simulator_14_hack_online9e845.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 5596 bytes
SHA-256: 6eaa935cbbb6f01b9c24255f544f1731d0cbc2a83912dae56faea04cbe9d7aeb
font_01_sfnt_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 10672 bytes
SHA-256: 97b9b4c3bd733355f3badd08588f2a17daaf205f829d9e2598d280f24fe8e8b3
font_02_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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