Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a3a08fc1f802ec…

MALICIOUS

PDF

74.3 KB Created: 2021-09-12 09:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c838ff197377012ca4101c0577134da SHA-1: 8ae22e5701b59dd4c01a07cdca4edb04a3020fb8 SHA-256: f1a3a08fc1f802ec1c85c48a53a749612a3ad28dae8a0c1645b06c111d689a45
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a 'Fake CAPTCHA' heuristic suggests the document aims to deceive the user into performing an action, possibly to download or execute further malware. Numerous external URLs were extracted, many of which are likely part of a link farm designed to obscure the true destination or distribute payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=frp+add+2018+apk+download PDF link annotation
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/pazawubivuwamiputo.pdfIn PDF document text
    • https://papiratisk.cz/soubory/vagetupajapetajuba.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ninewusewetakiwutit.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/33972477134.pdfIn PDF document text
    • https://anaksemut.com/contents/files/lejenigat.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/38769503539.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/29352741752.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/35157059805.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cf7ac544121d9aa66ddc484f78c65802/bikiraxe.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/fawivonotelexeto.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/notubevixaserizivode.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/75733373446.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/wexuwowawikizix.pdfIn PDF document text
    • https://anfauglir.com/images/file/58806175152.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/degofaturezesalib.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/69102512132.pdfIn PDF document text
    • https://lecachet.fr/docs/files/3669306693.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/wizeva.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/namakevotuwokif.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/lomaxobobefatoxu.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/gomofenafedevebe.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/29780414608.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/jezevusaxarekigerinulam.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_off0000c0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B9 16796 bytes
SHA-256: 039a720dc036a97b4e9f086877446633d4611da00b518ba470609a99aed2df86
font_01_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 10552 bytes
SHA-256: 27310c75a382f03969cadc188898c58d6d5f75f549df32322c5b9752b9a13b87

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