Malicious PDF — malware analysis report

Static analysis result for SHA-256 2846cf2e1438cdb2…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 23:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f38187d75d7268a14a6bcc210ac1e2ee SHA-1: 81b113e339e31df39f4ebeeede091d86d1c810a5 SHA-256: 2846cf2e1438cdb2fe253c4ecff58cabf538e1bbfef236d987bf58050ce8a2cc
154 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 numerous external links, including a link farm on disposable hosting, and a 'download button' lure suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fornacedelia.it/userfiles/files/dadepegufabudawuze.pdf In PDF document text
    • http://abwingsbuffalo.com/uploads/files/banotuzekitadobopogaz.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/34935560249.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/19912545974.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/41178674220.pdfIn PDF document text
    • http://195exim.com/datas/files/19880937899.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/4860299191.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e47d99f753---31252783131.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/jatiruka.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/37035858294.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/sewugomonajuzap.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090416154073499.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109020920425062.pdfIn PDF document text
    • https://kawanmto.org/contents/files/24800119147.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/vigotupejuziginubexomax.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/89243849168.pdfIn PDF document text
    • http://poliinc.com/upload/files/91671177295.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/dajizegoradepatuzoxa.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/muweferobewum.pdfIn PDF document text
    • http://kyea.org/imageuploads/63023818949.pdfIn PDF document text
    • http://chamdure.com/DATA/files/sunidanibinid.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/gekitafadudemeroni.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/kidojiwixexonemedu.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/foverubirobudutalobixikun.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/rokatevifezir.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/29453415039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cod+4+multiplayer+free+downloadPDF 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_off0000c99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99A 10900 bytes
SHA-256: 8aaa742ccc650c710d96ffb77c625ececd453ff9ff2d03c9a3c8a7092f226506
font_01_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 16984 bytes
SHA-256: 75446dd75cbeffb28ab86800b912208cf3fa6c8f9f2a40b4297725390a18398b