Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e47b366b892531…

MALICIOUS

PDF

67.6 KB Created: 2021-09-25 17:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3a7a647e4cbbfc746a51dcd2079ca7d5 SHA-1: ae192725534781ee2daf9047caa7d28042ebebcc SHA-256: a4e47b366b8925315ccbf5aa788143cb213915d77891b5abd9f39295544a918f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to hide an action trigger. The numerous external URIs, many hosted on disposable domains, further support a phishing or malicious content delivery scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=mha+season+5+full+episodes PDF link annotation
    • http://naszymsladem.pl/upload/file/24164054681.pdfIn PDF document text
    • http://seasplendorpetro.com/userfiles/seduluborobaxu.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/89948011644.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/rineminugevaniwuf.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/rubikesedozujuredimemed.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/27609786552.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/18851605064.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/84203177999.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/dedeladubi.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/79320888038.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/pifobabe.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091223474873499.pdfIn PDF document text
    • https://edgecs.com/documents/49838581232.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/zekekamaxezajumawizipa.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/49460784938.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/lamulapuloluvolijajasif.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/gigewafizexizixuzaz.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/xegafurufife.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f791b673d5---wotujeriketowuwu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5385d6387---34987050332.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/ratowadolebog.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_off0000adcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADCF 14088 bytes
SHA-256: e9037088cd47d7792e75be929550ec1420a7db72711d0988182672bf01df4e7d
font_01_sfnt_off0000d0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 10624 bytes
SHA-256: 68ac543c923d33eb8392bb4945e9ae3f46cf806bf0a365cbc3a8188cf4c5d049