Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ab9161657a2261…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 01:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22f7061d6cddee54e11ededc715a1c03 SHA-1: ea7ac155df3c5b8a96e1ea65b285a332cfec3ac8 SHA-256: f3ab9161657a2261208d85bb80b54114cc373c74e94c4b03d6abdf08079ffcc8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm and a QR code lure. While no scripts were extracted, the presence of numerous external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://hoangvan.vn/wp-content/uploads/files/44136980228.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136f84ab27ec---nijogeredirujovituwejakax.pdfIn PDF document text
    • http://risme.vn/files/zibine.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/1631127699.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/10016478891.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/falosupusukuveguzege.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/patiganerawetofitifa.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210908_102234.pdfIn PDF document text
    • http://ipceurope.be/assets/file/37623507587.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/jutiwedakalanipukenigenig.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/rexiwuvaribul.pdfIn PDF document text
    • https://auto826.com/uploads/files/44040297012.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/44317540616.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/3532840325.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/37360402336.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/16693560299.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/013c3944b4e6016631dc134a3d265a9d/8224972065.pdfIn PDF document text
    • http://eichler-kammerer.de/fomovanaxakuzotukaxubo.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/wabuvalazeseberobaseja.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/89844505849.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/xevox.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/jasapita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=qr+scan+picture+on+phonePDF 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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 17564 bytes
SHA-256: 65dff2b0f782943bc354611b0be5c595cc8dff6bbc3441f3e5411ceba0204931
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 10584 bytes
SHA-256: f7e384873c00ffa8622e6bd535ce719033970969c99be35b171df8f8a803095a
font_02_sfnt_off0001201b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1