Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96b512f4cccd6da…

MALICIOUS

PDF

80.1 KB Created: 2021-03-24 02:19:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 90c9794f16d23905c200569a9fa1f527 SHA-1: cde7971734e9ad378155fee83ada55870205cf43 SHA-256: b96b512f4cccd6da5088f60ffc184cda0e8893302c82c663261cf08f7abd1acc
126 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Excel spreadsheet formulas for budgeting', which is likely a pretext to encourage users to click the embedded malicious URL. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/strik?utm_term=excel+spreadsheet+formulas+for+budgeting PDF link annotation
    • https://cdn.sqhk.co/kapapomabu/LdhjgkK/42326875725.pdfIn PDF document text
    • http://dorightpress.com/forest_exam_answer_key_linkzhmpb.pdfIn PDF document text
    • http://esclub.pro/litebrkv5l.pdfIn PDF document text
    • http://marketop.club/bavebubuhsi6n.pdfIn PDF document text
    • http://vashobereg.com/i_walk_into_emptykwhji.pdfIn PDF document text
    • https://cdn.sqhk.co/fekepazerox/NhaB0cK/twilight_fangs_romance_you_choose.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374024/normal_6002e55c1a797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_6037769c39d6c.pdfIn PDF document text
    • https://cdn.sqhk.co/kubasovusi/cijcphg/ayyappa_telugu_songs_free_320kbps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_6014c0b589678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_60392663da806.pdfIn PDF document text
    • http://andyhongdigital.com/how_to_charge_karecel_hand_warmerbaovq.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/gcgfe7T/cheat_transport_it_idle_tycoon_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_8732208aaa9046e7be27beb79463729c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozuga/approximation_questions_for_sbi_po.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41fedc4a-6899-4890-abef-d576775023d5/stealth_cam_cellular_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/information_of_albert_einstein_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/fire_report_california.pdfIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_631ed9ee0bb149708170a9d46df36c64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec78c11-cadf-473a-ba98-70c9f43c9d3f/nituvusuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c271f9ce-62bb-4ece-b147-723a7a5dd663/what_does_stand_out_mean.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_f2931b67077e4f53b8a139d5e7f91fa6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6cfb6fd-2f3a-4acc-abb4-1ddde904ab97/how_to_set_the_time_on_a_citizen_eco_drive_e820.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_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 5732 bytes
SHA-256: e295439f40aeb74e44a6bdd22b41be143baca40fd5aa46c9521045aa3a889f12
font_01_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 11156 bytes
SHA-256: 1dbf6b24b4b944dbd0c409ae12bcd043e43f0d9404bb3e1314c906b47b439340