Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86a7ad7fa9b267c…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 23:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db60cb9be98a22ec2c65f2bad34bc39e SHA-1: 30e368f748d7419651eeece31a3c5358cdda2de7 SHA-256: f86a7ad7fa9b267c4e137dd5997be9873d0b2d9b6cfea22e6ef16da4bdabe464
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL distribution suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://boucherienabli.com/uploads/FCK_files/file/zemipudufu.pdf In PDF document text
    • http://mtecommerce.it/public/news/file/2063204690.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/64552570426.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/84485600090.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/73022319461.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/62342429109.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/nurapanijunafefigixix.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/mumititivumiletoxugagem.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210910185200.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1630960590.pdfIn PDF document text
    • https://hse.tw/upload/file/burunezewi.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/18755817675.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/tupukodoviwojob.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/39366038700.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-6/20210906194816832875.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/pesasemus.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/koniwonowasuromulorexefit.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/56661139888.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zufemotegupag.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/59343539366.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f537e1e32---6064778649.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/zupizabip.pdfIn PDF document text
    • https://arerp.kr/data/file///fakazerox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=using+phone+as+webcam+usbPDF 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_off0000be6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6F 16504 bytes
SHA-256: 0ed64c5432c871f262f2d54dc2397075c32458a7f29cbb8703a467102d36bb8e
font_01_sfnt_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 10908 bytes
SHA-256: bdb82a3c3c1dd372d02a38494d34546ffe6d3b1324d6b27805d3f671f7600d1a
font_02_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1