Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b16be01f8a08707…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 14:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70341018935a5ef768ce0b826a3b9dad SHA-1: 478f19e0bc8ea7c8be58eb6115f47508961bca99 SHA-256: 9b16be01f8a0870743e6d766b1a0ab2b1e853727b42da369b19a8bf4bf717263
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The primary URL, 'https://smidgel.ru/uplcv?utm_term=play+store+store+app+download', indicates a lure related to app downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://smidgel.ru/uplcv?utm_term=play+store+store+app+download PDF link annotation
    • http://kcde.kr/userfiles/file/33143432861.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/makunijijibelujedebilo.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/movamon.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/noluxobudimu.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/wudeva.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904065940750064.pdfIn PDF document text
    • http://chinalabware.ru/d/files/58154920850.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/60f087d3f69644f8f8428cec7ec65374/60273587256.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/xunululurabeguxetoxepu.pdfIn PDF document text
    • http://hiniceshine.com/upload/bumate.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910060820.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/xanawekubutekakojop.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021962322107600.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/17153554421.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/33733241296.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8015c422---nakenijukaxiden.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/85960989318.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/55343793655.pdfIn PDF document text
    • https://kristinanamaste.eu/files/juxururabipujituvu.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/kidawoxujifojijetosiseke.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/49722043685.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/tewuxomufitomemolex.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/47349007754.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/69798770681.pdfIn PDF document text
    • https://eguiders.com/uploads/xevofuzibozosapa.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/sevatijemepa.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/54474702353.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_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 17432 bytes
SHA-256: 9ff275ba5f43976ed3488530ae48ef473c0184e543ee453856247dc1b3bd41f0
font_01_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 10492 bytes
SHA-256: 93479bc9e8324be2775d32db303a27f5b008dad09e74b37d1ce0b7d4ad53bce6
font_02_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1