Malicious PDF — malware analysis report

Static analysis result for SHA-256 5727cd17df01df85…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 13:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dde280c5b19e102ac2c7c3bf175e0096 SHA-1: fee716a45e4d1d494263c4f14d545712e7ed9221 SHA-256: 5727cd17df01df85c5c3e39e66ac7f3fa14c770532ff980362b9f828c28ce003
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on multiple disposable domains, suggesting a phishing or redirection scheme. The presence of numerous unknown URLs further supports this, as they likely lead to malicious content or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://theemasternetworker.com/ckfinder/userfiles/files/puvosa.pdf In PDF document text
    • https://olamare.com/img/uploaded/file/letika.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dunefikimu.pdfIn PDF document text
    • http://szcftz.com/upload/20759309756.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/besadalososutifanavivu.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/butawebotisazilevol.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/pomimisesurugo.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/79483982445.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/91065781278.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/90931385620.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/xezujeleg.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/tewigu.pdfIn PDF document text
    • https://cmf8.ir/data/file/89861368588.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/54714895298.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/66248200749.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/86231784753.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/nezikevaneriromodanadan.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/jepatugatabonimupi.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/neketokupugufijube.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc8c2bef1---63167156525.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/13485058509.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/27299497521.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/kotoperikiganowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dog+training+barking+at+other+dogsPDF 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_off0000b0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D7 10716 bytes
SHA-256: e20cf12e08349ddd7fd5937340237610d4ef87c688f0211a4c4f477280de21bd
font_01_sfnt_off0000c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92A 14800 bytes
SHA-256: b83b2a0d0291cce45706257b33e0d299361d0a4f3e1bd3808d9f0e9e0e6a24b1
font_02_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1