Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf4887c8495f9da…

MALICIOUS

PDF

88.6 KB Created: 2021-09-18 11:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d882ae02cb0f8bd08af3110fc78b1d3a SHA-1: 719804c6d7b20186d85cf3ed2e3bc5fc4a03f6ca SHA-256: 6cf4887c8495f9da2eae40959119d8bdf7d7507aff23bc672c0c31db88c396c1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to potentially malicious or disposable domains. The presence of many distinct hosts and a high number of links per host suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://vibrobeton.by/pics/files/20718450969.pdf In PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/51725739313.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/45664372966.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/dasedup.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/nurofujozekopanabo.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/645456285.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a31b45bb4---febelumopitepupu.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210908_E4F55293DCDC820D.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/tivoreboseviboza.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/46799851730.pdfIn PDF document text
    • http://195exim.com/datas/files/49338898990.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/wofiramunalopuxinifemel.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/xevutun.pdfIn PDF document text
    • https://artbynela.com/uploads/file/26569362988.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/juperetanegefivona.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/31432465040.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/18053787083.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/zufusulerefafegiratafal.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1307524148613c90a88d6eb.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/90314803257.pdfIn PDF document text
    • https://j26clean.com/upload/files/94367280502.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/57694233460.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/bevaxavurekogoki.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/76655989451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=watch+crazy+stupid+love+full+movie+freePDF link annotation
    • 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_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 17640 bytes
SHA-256: f6b36ec4cf9763727c274b6eccf34c39747e349aae90b5665f4411070ada3755
font_01_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1A 11112 bytes
SHA-256: 94b071c85bde02881ae8b9b93e17714b0b766579c8ae7f78cc2c1474f1217d21