Malicious PDF — malware analysis report

Static analysis result for SHA-256 913e3a8a0858cd0f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 04:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d233cde00af23a900c4b25c9a67a4bdb SHA-1: d2181c7fc5b4f36b88e9f28663e8c179160ac049 SHA-256: 913e3a8a0858cd0f3b01cd2ffbbbd3e3b848f3e231dd74ba5b3e7d2809c5ebcb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable hosting. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malware. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fotobolfestmeny.hu/mvc/userfiles/file/74158268694.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe0454d870---kazedugonerilunitalapi.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/91183472588.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/79375191320.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/vebowutozo.pdfIn PDF document text
    • https://tch.lu/files/files/taganagivuxovir.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/gedetoregililusotaged.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/12613850532.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/tojix.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/98576064695.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/50902682247.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/70442252951.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/15311749912.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/jojatuxoxezubo.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/64921144415.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/58047488695.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/66280769691.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/6121903194.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/7678759624.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/74524088819.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/xuvasizojowapopuzes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=app+cloner+mod+premium+apkPDF 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_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 10584 bytes
SHA-256: b5e121d7f186b983821cd492ae016c5d880d2a63b5ec533e3612980c73457367
font_01_sfnt_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 18136 bytes
SHA-256: 9e4d5d440a25382a8917ae3a78c54e99e53940feb580ff228a2ec6f01ff0dff8
font_02_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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