Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a9651bccc3c60d…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 11:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1af82acaa6e0eb4134318fd91271bf3e SHA-1: 8623f2e16b7a8b109173c62d1ccc00c0d7038fcd SHA-256: a5a9651bccc3c60dfc7f71df51e81a57407950380e1558a60473fa1a250bddf2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, with one URL identified as a disposable hosting link. The primary purpose appears to be directing users to a collection of other PDFs, likely to facilitate phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613798897cac3---mozikanijofupavifinujowab.pdf In PDF document text
    • http://aweibel.com/Photo/file/94456288614.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/86724624448.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/6843465216.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/mepenazisenidaf.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/43456469888.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/26393332385.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/82282799434.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/vapegegeza.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/83449538077.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/52040371925.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/56757537004.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/88081328911.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/xotuvaligarop.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/xiruwofipukedafo.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/fedexozinikebinamipa.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/nipijupodeguxubitukoweku.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/64319289482.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/33309591775.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/vepuw.pdfIn PDF document text
    • https://porfic.com/fotos/file/46237796495.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/31923344657.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e11c726316---37957893669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=naruto+senki+battlePDF 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_off0000b95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95E 16532 bytes
SHA-256: 085e1dce70751afe2cb3a06c1d0cf01eca1d283dd4ccac1b447bb4e26cdfc59c
font_01_sfnt_off0000e401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 10408 bytes
SHA-256: 4202915479663f6ea0670a988fd86e7a848f07794817d1128fc1d9050bef6825

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