Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18a5240cf1faa1d…

MALICIOUS

PDF

67.8 KB Created: 2021-09-29 00:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f1e95f313a2a683699d355fd4facdc0 SHA-1: 610d312b4c2bfb87256772dd25e2edf04d941c4f SHA-256: b18a5240cf1faa1d8380f1f2ee21fbd3ae762c6a0c7af90730fbc2ba622d4899
154 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing lure, including an image-only presentation and embedded external URIs. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The document likely attempts to trick users into clicking a link that leads to a malicious site, potentially for credential theft or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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.
  • 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://medvor.ru/uplcv?utm_term=free+full+length+war+movies PDF link annotation
    • http://veoguidecostarica.com/ci/userfiles/files/54333358585.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/vabolofuviniredijit.pdfIn PDF document text
    • https://tmtteks.com/files/36589266010.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/rokisuto.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109162154139998.pdfIn PDF document text
    • http://hanifeugur.com/image/files/kefedeserodojapajadumoxaj.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/jexib.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/73159372094.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/womadakegiram.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/mepasukawomeropid.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210921033221.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/borametolarizuzogapepe.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/20199409395.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/29010249098.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/78823526500.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/ginurirojizotatemid.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/jatewen.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210919_150323.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8e83688a---70887062136.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/94008884447.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/nepewidefurifu.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/woretexalinarasomagul.pdfIn PDF document text
    • https://intersat.lv/files/file/97937109484.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/95303284505.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_off0000ae92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE92 10888 bytes
SHA-256: 875a36df1a63d77e8ed76589efe37cabdca6612312d3af81f891fcc40d2ee567
font_01_sfnt_off0000c79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79D 13920 bytes
SHA-256: 6c357b1443de1af8223687cdee33a7589444389cb49a2ee5495c96ea980a8758
font_02_sfnt_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1