Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa829f13c27c6c0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-09 17:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 864be9ecbfe78647059a8ec6c095dc90 SHA-1: c655e7c61ff2c840da97e81ea210928f75b76e56 SHA-256: 4aa829f13c27c6c081828b26e591260889acf6c2910dec7ab4520262cff7648f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://aldwalia.com/userfiles/files/pegubi.pdf In PDF document text
    • http://auburn-properties.com/userfiles/files/sijabeterug.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/vaxitaruxolitafe.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109072044573595.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/pakixusuzej.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210909194555.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/lizoniko.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/mimowedawasoni.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/99992814214.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/pozazul.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/53109385705.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/9655351948.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/tolebavanagovoruzavavu.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/puraju.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/46929827292.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/83906201514.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///ditovorajopizowot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=appzova+marvel+spider+manPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C4 17816 bytes
SHA-256: e1a2a679383df84deb11415a03fef82113e5084ec941049d4b32d76a9dfe9960
font_01_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 10564 bytes
SHA-256: 63cbeadc68371a35a81c754959c394d9777c3b770e4382c9de94f0fd63f2378f
font_02_sfnt_off000117c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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