Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f761fa23ac2809…

MALICIOUS

PDF

87.3 KB Created: 2021-02-16 06:00:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: d9e0de8f73a57dbaed41196bb3699b6c SHA-1: 9801745260bc80785dade5ce24a1e8e77b2e3518 SHA-256: 93f761fa23ac2809fcb6948cca6636762218e5999fee4563ed289b2e268ee12c
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jottigo.ru/wix?keyword=pet+supplies+plus+live+animal+return+policy PDF link annotation
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/kumixemefip.pdfIn PDF document text
    • http://registrat.space/adverbs_of_manner_list_in_english_and_spanishzp13p.pdfIn PDF document text
    • http://helplnstagramoffice.com/market_leader_pre-intermediate_teacher_s_book.pdf097g0.pdfIn PDF document text
    • http://eurozone.pro/artificial_intelligence_articles_2018jtwo4.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/account_form_4_bab_22j9aj.pdfIn PDF document text
    • http://bomufofo.iblogger.org/bigovizid.pdfIn PDF document text
    • http://begemot.space/building_management_system_honeywell8drkr.pdfIn PDF document text
    • https://bazunebusa.weebly.com/uploads/1/3/5/3/135397504/janilizo.pdfIn PDF document text
    • http://wukivobezoba.iblogger.org/annotated_bibliography_guidelines.pdfIn PDF document text
    • http://canonsburglake.org/linear_programing_problems_worksheetwmjsq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/amma_songs_free_tamilwire.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/wonizowuzorogog.pdfIn PDF document text
    • http://fekunowan.epizy.com/ganapaxiwuweneligup.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/78457287661.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 2828 bytes
SHA-256: 4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9
font_01_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 5240 bytes
SHA-256: 7ede31ca3e1e3fcb69a666b85d066b6600b9b3a73e112e408a185ed18a0cb7e5
font_02_sfnt_off000129e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E2 10992 bytes
SHA-256: 9ecbb2e7424825eb36b6f0ae33b3e67fc2fc069cd7a38022854c46f84b25e100