Malicious PDF — malware analysis report

Static analysis result for SHA-256 956582964632f6a4…

MALICIOUS

PDF

68.5 KB Created: 2021-09-16 18:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a1b7eddc26950e6293e0b13552f893d SHA-1: f533ab441e495fdfea907911295075d263b4213b SHA-256: 956582964632f6a480393fac681f7cceaf16426b5bf3d5a26c5b531b326edd32
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. Heuristics like PDF_IMAGE_LURE and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this. The ML classifier and ClamAV detection further confirm its malicious nature, likely leading to the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • 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://archism.ru/uplcv?utm_term=flash+samsung+firmware PDF link annotation
    • https://istanbulbalbir.com/upload/ckfinder/files/bifawawesuvokep.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/55747878150.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/21054359126.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/33665010600.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/65937834045.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/tuxajelipeledewojirumigo.pdfIn PDF document text
    • https://bagstyle.uz/images/file/80288387740.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/90565558222.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210914_0937DBB9CF2B9190.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/364f0e0f5f7bfa4b2403c9fb29c9fa58/57542526202.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/80122361865.pdfIn PDF document text
    • http://kccmaul.com/files/files/pigedogewuguguwezatoboda.pdfIn PDF document text
    • http://e-district.org/userfiles/file/bukobip.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/bufesogikukusovipunoki.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/xavuramiji.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/1655374261.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210906141701.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/15397845386.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/voratofojifuzeluk.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/69726106629.pdfIn PDF document text
    • http://silver1979.com/upload/file/baxixor.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210908_4407E33F2C718352.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/zonufopol.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/losuzipoxado.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_off0000b1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CA 14060 bytes
SHA-256: a19da271f28c7525a1eb3f78e2a1eda7221e17bcbb6b551a516db866c741c8fe
font_01_sfnt_off0000d475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 10608 bytes
SHA-256: daed34da25584e56a95f9a40032c9af192e7d3dd6144975bc41339bc7ab96354