Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f8ff0382f46936…

MALICIOUS

PDF

84.6 KB Created: 2021-09-22 11:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5429e524f883dfec773529b57b243f10 SHA-1: b5dc9bd683eaa1be9b29e45095363470c467f7c9 SHA-256: e3f8ff0382f46936b1b29ea9b40267726813218c080c435c2dbf7ea7e1a299cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs indicate an attempt to redirect the user to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=android+cpu+support PDF link annotation
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d873186b8---salenupetifelififiteda.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/wuzajekabipow.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/48661831704.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nabopibi.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/bolorolezi.pdfIn PDF document text
    • http://skene.es/userfiles/file/manizuxumozow.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/6603942090.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/18302767098.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/beramuzefovubesefeme.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/67090287373.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/93510992.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631232769.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/fulebifazol.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/25518669454.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/vukimukunotararisijura.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/93267610654.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/walitebubimotakijavugosa.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/98035797318.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/28257177601.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/69420254313.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/nisorodamomowek.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/sagowu.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_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 18100 bytes
SHA-256: 83eb89d24c0bfe022d3e924c21d5324a3a63fa1bee64194ced54859c73e0af4b
font_01_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB1 10248 bytes
SHA-256: 50608da8643d7d655020030aeb9ebcc25c5639cf78d027823fc5aa722acd04de