Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce875ba338a1f2a2…

MALICIOUS

PDF

80.9 KB Created: 2021-02-15 04:07:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e4bc4ec0692f69cffd485b7e17062090 SHA-1: ad78da5f8aac712cff4c40997bfb2f6e62cbc758 SHA-256: ce875ba338a1f2a29b86d0754224527dbcd689f28cfffd3e2ec5610d42996e1c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to distribute phishing content or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=modern+blues+harmonica+players PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5ff67863017ab.pdfIn PDF document text
    • http://myyshooop227.site/m._b._a_di_full_formrs10j.pdfIn PDF document text
    • http://amst-watch-v1.club/common_core_6th_grade_math_workbookaohow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408346/normal_5fe5f3cb62ac8.pdfIn PDF document text
    • http://nolaxevoxuvelij.iblogger.org/journal_biochemistry_reference_format.pdfIn PDF document text
    • http://intekzafast.online/esl_countries_and_nationalities_worksheetf2xpz.pdfIn PDF document text
    • http://rapisakaxo.66ghz.com/cadmium_melody_english_song.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/7979981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_5fd1434567eec.pdfIn PDF document text
    • http://dresdenpharma.ru/najelupa6mrnm.pdfIn PDF document text
    • https://zaxixeresez.weebly.com/uploads/1/3/1/8/131871416/jilup.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/816dc6aa61f8cd9.pdfIn PDF document text
    • https://virerulifig.weebly.com/uploads/1/3/1/4/131407283/f92b433dd29b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475720/normal_6017359f80beb.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/1f5185cfa6bc9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454164/normal_602862103adad.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/fce8b2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dulubuli.rf.gd/bangla_tv_app_for_pc_free.pdfIn PDF document text
    • http://wasalesex.epizy.com/kia_cerato_manual_2011_ex3.pdfIn PDF document text
    • http://natizat.epizy.com/spoken_english_book_in_gujarati_free.pdfIn PDF document text
    • http://pogedezibak.rf.gd/daravobabemelonigo.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_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 5560 bytes
SHA-256: deb34a374988f43459559514d951bf48e04ab3b54eead37e74f3ebd2c4d14cbc
font_01_sfnt_off00011188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11188 10192 bytes
SHA-256: f8fbe2a496a310f502a8ab3a67d6820002ac12a4d2aa6f7b4ec305244ca73ac8

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