Malicious PDF — malware analysis report

Static analysis result for SHA-256 9359cda839effcc5…

MALICIOUS

PDF

79.9 KB Created: 2021-03-22 21:12:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b5a51c5aa783be0d746e5ceae145d731 SHA-1: d898ba9fda71f8f2b635b052414db44df7587f25 SHA-256: 9359cda839effcc57b20cd525b3494cd0684d78cd7f378ba84e48aef493b158a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/wix?keyword=inelastic+collision+problems+worksheet+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427529/normal_601705409b6b9.pdfIn PDF document text
    • https://tafiweva.weebly.com/uploads/1/3/5/9/135993394/48fa3bda66ea7a0.pdfIn PDF document text
    • http://mishabelle.ru/cost_control_engineer_interview_questions_and_answersbff6o.pdfIn PDF document text
    • https://rumevupalod.weebly.com/uploads/1/3/0/7/130739773/zimelobokegikag_saripakavube.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/9080985.pdfIn PDF document text
    • https://zaloposigino.weebly.com/uploads/1/3/0/7/130739621/fenotediwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470226/normal_6036f5b3c0372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_5fdbe3abca296.pdfIn PDF document text
    • http://ergors.space/bixufekimdtju0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5fc6cc412656a.pdfIn PDF document text
    • https://tijoteveduno.weebly.com/uploads/1/3/4/8/134853829/7477855.pdfIn PDF document text
    • https://memapuzubabevu.weebly.com/uploads/1/3/0/8/130813849/22ddca.pdfIn PDF document text
    • http://pressit.fun/bidirefuwozigemidodidab74qb.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/waxibirelixozogob.pdfIn PDF document text
    • http://s7hmus.org/how_to_structure_a_startup_business7ouk1.pdfIn PDF document text
    • https://dalideno.weebly.com/uploads/1/3/5/3/135384103/4bfd4da420.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/lang_leav_books_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412403/normal_5fdc86f5134ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fomepufasele.atwebpages.com/how_to_make_sentences_in_english_with_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1504ecd-e815-4bd3-a575-5eb19de3a222/32491741001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e8a2ea-6b29-4d96-9fbb-7d61f25f839b/zutupozitujiwopoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390caef0-fad8-4bae-9671-7c14dd9db2cc/tatagilamokavarolutiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4012ea30-d251-4786-8549-59ef17a411aa/dispute_resolution_methods.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_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 5404 bytes
SHA-256: 4d1de872ac80dd7f8b15e30d6c933d4b3f9376bed27f8706752b3a9797db0b03
font_01_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 10524 bytes
SHA-256: 2b0fc95a914f7b82ca809a8c2180dfda6c8ca3179a933b1905cb66fe48d5fc5c