Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e3ecc60db48d3f…

MALICIOUS

PDF

73.0 KB Created: 2021-06-09 15:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 27c6337bfc3eb8eb9e3879f7a598fc18 SHA-1: ca335841e66b6ad37b1f8bcab8e30d8debcc5e09 SHA-256: c8e3ecc60db48d3fc4e936cd1e1a58037b568f7c6050624b6327996ffd7905ce
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/pbw?utm_term=lithium+oxide+ionic+or+covalent PDF link annotation
    • https://tadiseregofinu.weebly.com/uploads/1/3/4/7/134748358/3f5b9ba8b43880b.pdfIn PDF document text
    • https://tejukazirinari.weebly.com/uploads/1/3/1/3/131398521/pedatomukoxubisom.pdfIn PDF document text
    • https://muborite.weebly.com/uploads/1/3/4/4/134442605/kifer-zivapepulo-pesumenovepox.pdfIn PDF document text
    • https://bizowubojixix.weebly.com/uploads/1/3/4/2/134265373/30a98567.pdfIn PDF document text
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/ripekagarux_zosuvuwo.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/fifipesapano-tasezusilabun-sulerixogodegu-xukatomusef.pdfIn PDF document text
    • https://wobanavemo.weebly.com/uploads/1/3/4/0/134096337/3e04dc6a.pdfIn PDF document text
    • https://dujomujur.weebly.com/uploads/1/3/4/8/134883281/neduxenaju.pdfIn PDF document text
    • https://xowilululevala.weebly.com/uploads/1/3/4/0/134017879/9746769.pdfIn PDF document text
    • https://surumisaw.weebly.com/uploads/1/3/4/7/134707241/nadekex.pdfIn PDF document text
    • https://zemedabumudog.weebly.com/uploads/1/3/2/7/132712209/bddf58d8b6f71d.pdfIn PDF document text
    • https://vunamesu.weebly.com/uploads/1/3/5/3/135324142/dc39149355.pdfIn PDF document text
    • https://pesonukakevu.weebly.com/uploads/1/3/4/8/134863065/b13c66e69e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzobonesujo.pbworks.com/w/file/fetch/144521313/99406183487.pdfIn PDF document text
    • http://zexowisam.pbworks.com/f/free_printable_horse_race_game_board_template.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/f/67898598630.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144450204/daru_badnaam_kar_de_dj_mp3_song_free_download.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_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 5068 bytes
SHA-256: 0045d42e702d33c1e6be85e930e873c2ea3fd761689e01a1d77125bb4d0eb466
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 10532 bytes
SHA-256: 24b4b1a88619a47816a6b33a5069ff43c7ef58c33e0aa8e91834e270cbdd35ec

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