Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1eaf324ed6e1b85…

MALICIOUS

PDF

67.6 KB Created: 2021-09-14 11:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ddea06fc928fea844bae8218d491b989 SHA-1: 5e9e573dacfe5cf8bd95c775b9d906fce0dff248 SHA-256: e1eaf324ed6e1b856339c015e9b52c5e51caa34f367234819000a29bd4ae87a3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-only facade with a clickable action, typical for directing users to malicious sites. The numerous embedded URLs, many pointing to disposable domains, suggest a link farm designed to distribute or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://autosoftware.company/autoresponders_images/files/talewizedomuv.pdf In PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/tojojuxexifuzanoweku.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/76301640921.pdfIn PDF document text
    • http://proxima-online.it/public/file/40626903757.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/porar.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/41513059234.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/39018211426.pdfIn PDF document text
    • http://gdgom.com/upload/file/210904073309905895nwgbmdp21sb6.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/dorona.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/45137261609.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/wedog.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/sazesawipukaniguditumapun.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/81697060598.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/3034931789.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/kizubetalukivepuja.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/fibomofi.pdfIn PDF document text
    • http://elsped.hu/files/file/43614565786.pdfIn PDF document text
    • http://3sdent.com/upload/files/xejomuditofonero.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/jedigaguvesikigipag.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/gorelak.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/66303251167.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/ramumazegesubizakinolog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+themes+for+androidPDF 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_off0000ad4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4E 14164 bytes
SHA-256: 57b0578f798ada96fa8fba144edb8d1ac2cd41e6b85fba6072d95c01e95830c4
font_01_sfnt_off0000d0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 10704 bytes
SHA-256: 520b4aa932006e42cd5546abb6469327f35b6a57b77fe9543cdbf3dfa7218a80