Malicious PDF — malware analysis report

Static analysis result for SHA-256 b592c79bd20d99dd…

MALICIOUS

PDF

82.3 KB Created: 2021-04-19 13:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0ec95ec95cdbf20337c8fd5562bc492f SHA-1: db3768f899ab184d457e2a43082a87775682d810 SHA-256: b592c79bd20d99dd505557fa8479b86dabd7ccc0db42e4ea6edbb91fa06ae9e0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=cateye+urban+wireless+bike+computer+setup PDF link annotation
    • https://cdn.sqhk.co/gaxozamikoge/O9hjjg4/oscar_isaac_dune_2020.pdfIn PDF document text
    • http://begemot.space/79312578764zc75v.pdfIn PDF document text
    • http://fb-ig-copyright.com/vuvezuxedatalikasudewiv3mat.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/ge5eBif/world_history_books_for_kids.pdfIn PDF document text
    • http://daliadiago.com/driving_process_improvement6rz38.pdfIn PDF document text
    • http://salonop.xyz/shear_capacity_of_beam_formulazp15p.pdfIn PDF document text
    • https://nagobajega.weebly.com/uploads/1/3/1/3/131380413/tevosazofifimafug.pdfIn PDF document text
    • http://mp4.design/el_guardian_entre_el_centeno_libro_de_asesinospylgj.pdfIn PDF document text
    • http://lnstagramsecurity.net/29724006470x5abg.pdfIn PDF document text
    • http://nosinoski.shop/91186155549u7yni.pdfIn PDF document text
    • http://whalesqpa.fun/decision_tree_algorithm_python_sklearn_exampleg5ld7.pdfIn PDF document text
    • http://kkkirrreeee.space/what_is_the_purpose_of_the_federalist_10lzw78.pdfIn PDF document text
    • http://bestita.space/manuel_autocad_2016_francais3un5u.pdfIn PDF document text
    • https://gofabede.weebly.com/uploads/1/3/1/4/131453232/tejefuxo.pdfIn PDF document text
    • http://canonsburglake.com/14624802804z45yp.pdfIn PDF document text
    • http://powerpoint4you.ru/tamisabobutanuxoztveey.pdfIn PDF document text
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/wasodelidunemimogole.pdfIn PDF document text
    • http://heymama.store/breadwinners_trophy_club_menu5kidx.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/SVSAhbC/63197519604.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/66c34fbc-d556-4562-84e2-565eb6a74157/medical_pharmacology_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9207130-14ec-4da1-851e-d383e0cf60fd/mojidutileg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f2a0a0-6ef1-408b-8091-0183da62697e/sakelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87dfe20b-3d71-460f-b142-123750a5c4ac/dibif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a19675-52c0-409c-a260-3821cc2c9ec6/diablo_i2_tuner_review.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_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 5384 bytes
SHA-256: 3f6f88bdd9e3424bfa2136a86de5a746bf38a977ccc543fb3e6a8f6058a35ece
font_01_sfnt_off00011862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11862 10380 bytes
SHA-256: cbad12e96769e81e833162e9b5e1c46f1e82def3e739261d7cb8420ca6687b4b