Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee619173af725cc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 16:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e805bf32f5b04e37647cf1be2d15b7b SHA-1: 0b884b2b247d3711385a8cd5c990c38e3454bec4 SHA-256: 3ee619173af725cc66a477cbbccb3a26cb680ae6f2938861e5420a4ad0974cec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to disposable hosting, suggesting a link farm designed to distribute or redirect to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=gravity+box+android+11 PDF link annotation
    • http://sipsak.nl/userfiles/file/39399019308.pdfIn PDF document text
    • https://retta-bg.com/userfiles/dutonoxos.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/nitazawuxexokogedov.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d5c17bb4---gaxusolarerez.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9d3e052b---64347739359.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/73824937908.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/26616925705.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/42499321308.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/16376470536.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/dovakojadoguxaboforige.pdfIn PDF document text
    • http://hocomesun.com/upload/25413734882.pdfIn PDF document text
    • http://chromavials.com/d/files/71829178323.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/ruxorofenesilovow.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/95140481681.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/64748853157.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/rabixunibefuwikenojebuvo.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/63168101108.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/novevesejaxesipaviwitowa.pdfIn PDF document text
    • http://harlit.com/upfiles/file/taturimivi.pdfIn PDF document text
    • http://maxbrio.kr/files/files/venizifebefodekuvazem.pdfIn PDF document text
    • http://scarpatti.com/files/22862955321.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/99352652908.pdfIn PDF document text
    • http://villkasz.hu/editor_up/jolusenasewigunamifeku.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/30546724240.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/58107496615.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/50431428805.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_off0000d8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 18188 bytes
SHA-256: 8df64f8d5d7b59ac1372d24e2610c8dc214c3541ce253afe764fe0794cbd6700
font_02_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 10408 bytes
SHA-256: 4e06892a3509aea1f21d512a5e0a4390b22c3a7f16414fcf5872b50c17988e32