Malicious PDF — malware analysis report

Static analysis result for SHA-256 4839c043b69c042a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-14 05:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8f3056dba2e53e5459182ba5f02849f9 SHA-1: ac0ea1cdc236386ad1c8c754b98f610bc2190dbd SHA-256: 4839c043b69c042acf505d69a674cc4c1b05e00c00448e421e39270022b3b220
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a QR code lure suggests a phishing or malware distribution attempt, directing users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://coconut.hu/userfiles/file/bibowefovafatujijeruxulox.pdf In PDF document text
    • https://livbiopharma.com/userfiles/file/76379252269.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/65900673497.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/zepilexatar.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/27121671387.pdfIn PDF document text
    • https://wsbtitan.com/images/file/2635512133.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/famulemeto.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/tufipixopemubemewaf.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/58686987233.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/95301120933.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/marixesatosazanodiras.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/voperozipetakopilorodaliz.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/23112842093.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/46820769157.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161326e7104bb2---7212220976.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/56124052521.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/wovomobipifozasodamavabo.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/xovevazinerupelav.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/gubisi.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/lazasomega.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/70780920458.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/diposapulufake.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/nesasujubu.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/57333173709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+generate+qr+code+in+android+studioPDF 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_off0000c0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F8 10820 bytes
SHA-256: f4b125477e9c86b69604f9f6f50f1b8ac5160283cc3a9fa369868d713440a491
font_01_sfnt_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 17228 bytes
SHA-256: 5643b4231afc1314891dc9d6b116b8f08b449fb4cd0d53ac56ec819b098dd70f
font_02_sfnt_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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