Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac0898cdde0bae1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 11:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e29ce8cfe076a4410ef353cc39511428 SHA-1: 1c92754739101622240d5df3f3f680d59c211af8 SHA-256: 9ac0898cdde0bae174b8567e8663b2d36679b6d398e488510938639c16db0308
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan distribution vehicle. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM firing further support the conclusion that this document is designed to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://pistant.ru/uplcv?utm_term=pokemon+i+choose+you PDF link annotation
    • http://www.cddfct.com/up_files/file/jibinedizejogoxolav.pdfIn PDF document text
    • https://equalland.com/uploads/File/jitupapap.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bfd135931---bolonetidiwixirivexaga.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/jowemibudezo.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/27404111653.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/24674034580.pdfIn PDF document text
    • http://levotst.com/uploads/files/70185757218.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af8d3ccbe---xifujirumeg.pdfIn PDF document text
    • http://wmsone.com/eimages/file/63935828914.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/jirasagatinajinesixudari.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/majulifitesixilu.pdfIn PDF document text
    • https://advik.net/userfiles/file/sunimobumamuxobo.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/tofetapabamunamowapuke.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/42561910139.pdfIn PDF document text
    • https://flomogroup.com/upload/files/29869916639.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/tonebasat.pdfIn PDF document text
    • http://simonide.org/userfiles/file/bojomeludajukis.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76516442006.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/29286617765.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/62788710679.pdfIn PDF document text
    • http://jump360.co/upload/files/20210902040011.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://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_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 18632 bytes
SHA-256: 13611319baf4f0c47a88933291266f6681075285e088c8a1767d35a78a1a05d7
font_01_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D6 10396 bytes
SHA-256: 15b39106869e605492012a98cc5e1749c10f99233b4c5f1b5f08f13ec3ca1360

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