Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbad2fc3d90a98aa…

MALICIOUS

PDF

76.2 KB Created: 2021-03-14 10:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d817cf37b4a6fc39b22ada09ac34c77 SHA-1: d2bf6a426daf4a284af4a60fc39bfbcdc88dd148 SHA-256: fbad2fc3d90a98aa0dbb607d2917400fc63732ce264e5c90462efcffdac0aca6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm, suggesting a malicious intent to manipulate search engine rankings or redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate malicious content, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=classification+of+occupational+health+hazards+pdf
    • http://bobejitamatu.iblogger.org/72614172034.pdf
    • http://trackengine.host/seredabufijazadubalogbhacq.pdf
    • http://zukilobuzoroko.66ghz.com/puzuxivor.pdf
    • http://dusexixegiseves.iblogger.org/batman_begins_movie_in_telugu.pdf
    • https://cdn.sqhk.co/kominepoli/hfej0id/758452426.pdf
    • https://kavixonew.weebly.com/uploads/1/3/4/5/134592395/df95cd43a0.pdf
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/833448.pdf
    • https://cdn.sqhk.co/gafisasiwu/dXBhgKL/64595666175.pdf
    • https://tikobivit.weebly.com/uploads/1/3/1/3/131382680/vukit.pdf
    • http://babysampler.com/polidedoreg3gl54.pdf
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/6670b55c0e69.pdf
    • http://ygrash.website/libros_cristianos_de_interpretacion_de_sueos0d6a5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xupizewuxere/what_does_the_word_submissive_mean_in_spanish.pdf
    • https://s3.amazonaws.com/fotepopunaj/newest_movies_hd_apk_android_box.pdf
    • https://s3.amazonaws.com/dibedamoka/madag.pdf
    • https://s3.amazonaws.com/davawina/examples_of_journal_entry_template.pdf
    • http://lumigetutiburu.epizy.com/50066303204.pdf
    • http://vazegazu.epizy.com/bogimen.pdf
    • http://pavunununege.epizy.com/62297939707.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0a.bin
af3e94c67275070c02ef934bf43a74fb72df74a2c001434539c1b3618a641e86
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 5196 bytes
font_01_sfnt_off0000fdb3.bin
4b6e915d2962da5a0803eca90193350bcd84d6eac3d54f760b45f14c644ab752
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 11092 bytes