Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf017f7d323e4cd…

MALICIOUS

PDF

87.3 KB Created: 2021-09-21 15:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f4444e7168d7c688f4e6f9e072096b3 SHA-1: edb894a6a3ff78ef0b5585415cac0223e441ded3 SHA-256: edf017f7d323e4cd8c6b0da2499f55fd03203862d2df208683fe5e82edd23099
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable domains. This suggests the document is designed to trick users into clicking links that likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=kim+kardashian+hollywood+apk+mod+unlimited+everything+ios PDF link annotation
    • https://matrixx.lu/images/26890595398.pdfIn PDF document text
    • http://tchid.net/userfiles/file/bebowamijamujekopirudep.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/99386180173.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99497d544---vefomisadevulirixo.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/27158986006.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613916c51c29a---nesozetakofafe.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/77314093662.pdfIn PDF document text
    • http://pi-consulting.ch/download/4891707156.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/79778309855.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/kosaxulilutezasubi.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/zerelifo.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/18418811772.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/nubula.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/89701255062.pdfIn PDF document text
    • http://lejonhund.com/upload/91447641480.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/jemogawusunuruxarekekira.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25028115040.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/luluzinivazerefobavedaso.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/litakine.pdfIn PDF document text
    • http://palami.by/images/file/38872460671.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/24915317139.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/57078738029.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_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 11288 bytes
SHA-256: 736718db23d0f44e5febfe333ad5cfd58c7b588170d01c6190a8057e0160131d
font_01_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 18228 bytes
SHA-256: b6326abfbce127590f0e8d4d37ad79064ba6b9652d701f639fb5a4e8af6b6d30