Malicious PDF — malware analysis report

Static analysis result for SHA-256 157e8b5e3693277b…

MALICIOUS

PDF

67.9 KB Created: 2021-09-21 09:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f2211d145329b6e4f912f36be619afc SHA-1: 0002d07b055436ccf46544dad25a3a9ba3490e9d SHA-256: 157e8b5e3693277bff167d803169587141211d8c05184796eaebd274bf84ca34
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The document is image-heavy and contains a clickable link designed to direct users to external websites, likely for credential harvesting or further malware delivery. The presence of numerous links on disposable domains reinforces the phishing nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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 67 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.
  • 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://philabc.ru/uplcv?utm_term=how+to+set+video+as+alarm+on+android PDF link annotation
    • https://whereestar.com/marinarubicon/admin/file/bifadewejabalebabuzi.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/d745424b88fbd49e64f495b2f2147e33/saxegufivibebalegejinu.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/41622625788.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/ridufat.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/41824781507.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec0b0abc8c---vuzebigamidowalifa.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/3465883165.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/95180175606.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/sokimanajaxikurewalojipit.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/62576486267.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/purivevipasumudulezolixe.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/pekadawazel.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/15969453836.pdfIn PDF document text
    • https://shibbirs.com/media/files/84423133540.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/53814258555.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/33889599774.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/mijitiluvijupur.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/71802212508.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/kejaratuvedeluwawofere.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/weligepusulud.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/dufifunisiginilev.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/tuvubewupes.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/zefegi.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_off0000af6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6C 14036 bytes
SHA-256: 16cbe2d11e444b5f5bdeb8751c3266dc046459af9b65fda2c96591e4ec6896db
font_01_sfnt_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 10552 bytes
SHA-256: 8516e8a5da4320d93284cb157dd553f3c6e5af815874cd0c3a461b8d68c22116