Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e0e4f98ba34a2e3…

MALICIOUS

PDF

68.5 KB Created: 2021-09-11 02:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c48c45729a166c05f599daaf4903f3a1 SHA-1: 8f374156d2ed701c839ab3f77de9f6749086a8d5 SHA-256: 3e0e4f98ba34a2e34b35fd7a8cfeb34993ad58e6fd0f5ae60d7fbc1ddbfa3cd7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common phishing tactic by presenting itself as an image-based lure, encouraging users to click through to an external URL. The presence of embedded JavaScript and numerous links to disposable domains strongly suggests a phishing campaign aimed at credential harvesting or malware distribution. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=types+of+mathematical+curves PDF link annotation
    • http://desiaussies.com/ckeditor/uploads/files/xivovemo.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090213371714.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/fenizazizesoraroneban.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4vhhg0eg92qf4aktmb8k66k3u4/lukudesixon.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/8994523120.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/muduxol.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/10803866929.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/5922482915.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/90900261523.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/42781681615.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/fajipamavemageji.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/96241815102.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/56313329111.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/30179886571.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/wakebisat.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/85584393437.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/73140957553.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/novikanivaz.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/xotujikigerozotiwazibi.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/46396684940.pdfIn PDF document text
    • http://blccy.com/userfiles/files/sulagag.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tuxaje.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/kivexamed.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/30705670569.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_off0000b0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C9 13920 bytes
SHA-256: 7ab428358cbeccceb1cd6c9c15dbdfaf06977ca09a11c9d92fdd5db16be48d58
font_01_sfnt_off0000d315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 10884 bytes
SHA-256: 94c35dae61197004f3aeea67fb9b2912a004846e41e7571b19b8d3ebcccb1326