Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d2e49c5d330de8…

MALICIOUS

PDF

108.2 KB Created: 2021-03-20 08:29:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3b4d5c8c1992240aefd4b6b7891b48f8 SHA-1: 18d1236ec1f5311b8f9328c329b83ce6ac11fddd SHA-256: 98d2e49c5d330de8318690fa8bd0366873a1eff077ffe2c771715c245e05071f
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. The document body, though heavily obfuscated, contains references to external URLs, suggesting a lure to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/wix?keyword=manual+controle+rc+n06gr PDF link annotation
    • http://idem-peshkom.ru/54226892259m67xq.pdfIn PDF document text
    • http://homebig.space/sasobuxoxowenavikazekeevc4j.pdfIn PDF document text
    • http://ro-shop.space/16134994295nhako.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/reflexive_and_indefinite_pronouns_exercises.pdfIn PDF document text
    • http://sayseedokg.com/60257290827c5pqe.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/personality_disorder_cluster_b.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/how_to_boost_the_left_side_of_your_brain.pdfIn PDF document text
    • http://onlyforyou.space/photosynthesis_lab_gizmo_answer_key_page_3uti66.pdfIn PDF document text
    • http://italystore.pro/how_does_bitcoin_work_in_simple_termsgntfa.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/6vhdREh/black_cheetah_print_running_shoes.pdfIn PDF document text
    • http://passive-income.ru/how_to_write_a_letter_of_recommendation_for_college_studentc4j9y.pdfIn PDF document text
    • https://cdn.sqhk.co/ladesajisama/eqWcgd2/lajirodi.pdfIn PDF document text
    • http://podjem2.club/asus_maximus_viii_hero_price_philippinesec93b.pdfIn PDF document text
    • http://my-favshope.online/clulas_falciformes_tratamiento_naturali0yxq.pdfIn PDF document text
    • http://kulanefimolon.mypressonline.com/best_ralph_waldo_emerson_quotes.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/star_wars_clone_wars_season_7_episode_12jtuu2.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
    • https://uploads.strikinglycdn.com/files/74373cef-a90a-4122-95c1-b1fe1923f2ee/what_is_the_best_long_pole_hedge_trimmer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b4cacc-7be8-4b37-9743-e438df3e2547/mechanical_engineering_jobs_entry_level_salary.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1D 11496 bytes
SHA-256: 101bf7b632c786f50a013cab6ec1f3b983b967288ae5dbcd1a867dfcce75c31b
font_01_sfnt_off000142d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D8 4924 bytes
SHA-256: d606c0ebeb70874a1b49793b780dec060d5377e5fc0618b928071acd58872503
font_02_sfnt_off00015399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15399 12596 bytes
SHA-256: 0921a1d599585a21c4551464927d80879fdd6fa781162c51ab709780915a6c96
font_03_sfnt_off00017a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A69 17780 bytes
SHA-256: 84de2050f40f252268c375532a46c6258b69c23994fac5a98594971ed66ee4a5
font_04_sfnt_off000192d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192D1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3