Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f18ff9e2ee60c0e…

MALICIOUS

PDF

75.3 KB Created: 2021-03-17 12:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6472af00aeea21c10e8eadc1f59e5b51 SHA-1: 6dd0c1c8c056cfcc7e4f0c693ef9a54c1dfc6cef SHA-256: 8f18ff9e2ee60c0e72558ca92f5bbecb9d74ac0c84a70f5ef71d67b7c2af1229
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly indicate malicious content, likely phishing or a trojan downloader. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attack pattern involving user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/wix?keyword=maricopa+harvester+ant+vs+fire+ant
    • https://cdn.sqhk.co/tisojubew/hc8iSom/39723395253.pdf
    • http://org-fruit.space/jerasopisekexuljsz60.pdf
    • http://jubigale.scienceontheweb.net/problem_solving_test.pdf
    • https://cdn.sqhk.co/begokaxawip/jj55jhe/aerofly_fs_1_flight_simulator_indir.pdf
    • https://cdn.sqhk.co/mapelimujeku/ihirITf/29845926609.pdf
    • https://cdn.sqhk.co/mudonisogub/6iiQssI/70118188036.pdf
    • http://catsism.com/ajooba_full_movie_hd_1080pwl9qz.pdf
    • http://dizurexemubegog.mygamesonline.org/virelem.pdf
    • http://tiwimifozukimu.medianewsonline.com/vamuxopepuruwogutu.pdf
    • https://cdn.sqhk.co/gusisezepemu/hghhApd/customize_real_cars_online.pdf
    • http://nifazafagikoxa.medianewsonline.com/wild_game_camera_pictures.pdf
    • http://wodekenizowa.getenjoyment.net/regasu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuxutedi/liruroxotiritajuwave.pdf
    • http://molujafit.atwebpages.com/12_bar_blues_chords.pdf
    • https://s3.amazonaws.com/sajezife/sepeniwefidezaloriwubexox.pdf
    • https://s3.amazonaws.com/mamibis/fopofigowasevimavuwojor.pdf
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_57717182e30c4715ba5582e2993d4683.pdf?index=true
    • https://s3.amazonaws.com/mejawiwomak/dujekejemenatelifawufabep.pdf
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_207f2729cef14e248d78666809376ea6.pdf?index=true
    • https://s3.amazonaws.com/bufipevuril/jugopafopibipifavigewinu.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_off0000e989.bin
366a325e2802837e5680304e5e5f0fa99020ec29358608213d8a688a123898e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 5136 bytes
font_01_sfnt_off0000fb16.bin
eebefc1d6789faa8a11cde802a21fc72dccf6eb56e96e95c5ddcf6bc5ad8c120		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 10764 bytes

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