Malicious PDF — malware analysis report

Static analysis result for SHA-256 801a603cb4e2e4f7…

MALICIOUS

PDF

76.9 KB Created: 2021-04-09 01:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a044c2f831687131e5de233bcf636935 SHA-1: e9caf8409091b8004df088bd021602df9043ec21 SHA-256: 801a603cb4e2e4f746d124b5f16dfa77bb7874faa621b9487f558c08b0d01558
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high-confidence ML classifier flagging it as malicious. One prominent URL, 'https://maypoin.ru/strik?utm_term=mechanical+engineer+jobs+in+bangalore', is presented in a context suggesting a lure for job seekers. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many links on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://maypoin.ru/strik?utm_term=mechanical+engineer+jobs+in+bangalore PDF link annotation
    • http://originalhallyu.com/hp_officejet_pro_6830_software_for_windows_10arbnr.pdfIn PDF document text
    • http://xbet1.fun/27807535245m6q1h.pdfIn PDF document text
    • http://es50off.pro/dirodat3w4ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500001/normal_5ff1aef22b49e.pdfIn PDF document text
    • http://fudazozotakaxal.mywebcommunity.org/core_java_interview_questions_javatpoint.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5fddb78eddb5a.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/psychometric_test_sample_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_60192ab04a0ef.pdfIn PDF document text
    • http://heretythere.site/89803363383wjwpo.pdfIn PDF document text
    • http://nunanokipikade.22web.org/colnago_concept_size_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489255/normal_6042ebdc339e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/910e24f2-45be-4bf5-a62b-536b0c06f003/modetoreroji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c7b2a6-06e3-459d-9cb4-1d2179f4af3c/erectus_walks_amongst_us.pdfIn PDF document text
    • http://rivamuboxu.epizy.com/28285375850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f3107c-c99f-4f7b-8a45-005bd3c919ac/where_to_find_the_book_of_enoch_in_the_bible.pdfIn PDF document text
    • http://nonosolagosev.epizy.com/70606353225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f982ca43-e647-49b8-9b3e-f1a5670ad149/how_to_cook_sliced_ham_in_a_pan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2233456c-0bd1-4ecb-96d8-ede43d98383c/dupovikirerexiribupudolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f707d9-799d-45c0-9ef0-e4be893215da/python_for_beginners_tutorial.pdfIn PDF document text
    • http://dunedobaxapekir.epizy.com/telecharger_application_journaux_algeriens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cac0da3-a0f9-43d7-992c-035bc043a332/75020157761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8297d99-c28d-4223-aeaa-f8bd074aeff8/72618547526.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 5280 bytes
SHA-256: 829b486c4cf8e470360f31e4795182e6364571938e0c353a277de0c7f7be9569
font_01_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 10676 bytes
SHA-256: b045972e303bd8b7771559322cb8704e8b73a75fe9a4600f67554902d2f31345

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