Malicious PDF — malware analysis report

Static analysis result for SHA-256 35221a351a08f832…

MALICIOUS

PDF

89.2 KB Created: 2021-03-17 11:05:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: eb81ff9fcdb94424112137cd892fe6a2 SHA-1: 1b51f4dfcac1f1ec70383c1bea37fc02dbc50e12 SHA-256: 35221a351a08f832c478abab0dbce20e853db83ace52b92d08861b8261a5d5da
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and a potential phishing/malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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://midufefew.ru/award?keyword=cancer+de+pulmon+pdf+2020+mexico PDF link annotation
    • http://nurokojo.mypressonline.com/the_little_match_girl_disney_review.pdfIn PDF document text
    • http://rixadixiji.scienceontheweb.net/18964856231.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/antalya_bus_map.pdfIn PDF document text
    • http://xovitixekewelom.scienceontheweb.net/sagozedusilotonojeromosu.pdfIn PDF document text
    • http://reggis.info/standard_practice_for_bracing_masonry_walls_under_construction_2012ur4ec.pdfIn PDF document text
    • http://avit0.cc/yangzijiang_shipbuilding_holdings_ltd_annual_report_2018yv0ig.pdfIn PDF document text
    • http://byseles.xyz/la_estancia_cierra_a_m_azul_nile_le50xjr.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/zukijeximazafakaso.pdfIn PDF document text
    • http://itwomen.space/8674938350922ulb.pdfIn PDF document text
    • http://zuvalasit.mypressonline.com/81721309674.pdfIn PDF document text
    • http://fuwijumazawad.mywebcommunity.org/12670483861.pdfIn PDF document text
    • http://boribonabone.mypressonline.com/9817724291.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/1e6df555-4b01-41fa-8505-6b5f16027317/33200163070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf64b37-ffd3-4c62-b31a-77a2e615c13a/beats_by_dre_speaker_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f772310-89a6-4095-bf43-7acb4c6c355c/96296778930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48dd220c-3beb-428d-b71e-942b3ce70292/how_much_does_the_maids_pay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd12a007-8ba6-4bf8-a40a-6bfae13ecf12/c_programming_book_by_ajay_mittal_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87f5b8e-4b51-42fc-9730-59f2698ba1bc/gallows_of_madness_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40087aec-ccc6-40ff-aab3-dcc76804945e/can_hp_envy_4500_print_on_cardstock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49868390-4df1-4d9c-b5fd-76e15a520fae/88184203108.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_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 5372 bytes
SHA-256: b2e5188c8ad8fa3cc3eb4be2048c0b0602d571945c1d956962151892ba7d1819
font_01_sfnt_off00012f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F24 11808 bytes
SHA-256: bce8cb2cf389ab6eb904169c5f46236f22ecb7b3f272caec083f64b1f4b35d7c

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