Malicious PDF — malware analysis report

Static analysis result for SHA-256 9880f243fdd51142…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 17:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ee05f17bbe9a6cd569b015a2e9e7d37 SHA-1: 16126cf200eeb69490ff0d6d6a0ffdf175b86596 SHA-256: 9880f243fdd51142d8d49eced3ea73dfcee0c4e99a2a1dd3e6b1ad79182d6869
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, with one heuristic specifically flagging it as a 'link farm on disposable hosting'. This suggests a tactic to manipulate search engine results or to host a large number of phishing or malware distribution pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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 http://azseal.net/uploads/userfiles/file/fivozipusabimelidujokate.pdf In PDF document text
    • http://pedraferro.com/files/files/goximador.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/8904760686.pdfIn PDF document text
    • http://ombs.ru/uploads/files/54350215168.pdfIn PDF document text
    • http://davcpundri.com/css/file/94229886760.pdfIn PDF document text
    • http://elskenecologie.nl/files/65445032767.pdfIn PDF document text
    • http://tykhchem.com/upload/files/zesatugusu.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/beviwe.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/35786744804.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/magexefov.pdfIn PDF document text
    • https://andana.us/files/files/2719987881.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/nagolasofevimujapegamipar.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/tirabojifupogogi.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/zixibesoxupurafonobivu.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210920_89ACDF5E73EB41F7.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/ruvumamexokotozeravaguto.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/68261411117.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/viladaridaxebexuzipimiv.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/nedikumebumuxulekugula.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/12707177157.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/setig.pdfIn PDF document text
    • http://iucecb.com/files/file/zawevatuxidapurizat.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/ramugokefabozetoperofer.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0230331399930e395f15ed24a8f79aed/91660383408.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/sefunelajef.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/zuragemutiroxiniwawav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=watch+it+happened+one+night+online+freePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 10724 bytes
SHA-256: 3770877b2e4a9de5c3248f38494e823b3d7ee47bcaaadf5d91ca611d1afd2867
font_01_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 17876 bytes
SHA-256: b99d61e7f882eeb460c786e0c9805c46507f7bb39cfd68d24fd464a2926f1e1a