Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b1b282237f5eef…

MALICIOUS

PDF

87.4 KB Created: 2021-09-20 22:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99d877a9620802f83a501469c0a3ab43 SHA-1: ea79ee48872c1352e7e29042a5980c0720c355e5 SHA-256: f1b1b282237f5eef59c43d1ad80f3739a22c39f987cf16c693fd7c0b96b9fee3
162 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The document contains a visual download button and a callback lure, suggesting a social engineering attempt to trick the user into downloading a payload. Embedded JavaScript streams are present, likely used to facilitate the download or exploit process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321bc6e5866---liwanidamakofimomaliv.pdf In PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/28664943124.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/8538539297.pdfIn PDF document text
    • http://wenxuezj.com/images/File/77680630433.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/46883788645.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613cf038e69f4.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/xewameg.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/dejeruradirixejupab.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/12557552874.pdfIn PDF document text
    • https://adikkedua.com/contents/files/jamefuzefazalutodijebix.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/tumet.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/mofipugefav.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/33987022975.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/29158515690.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/86781009081.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/55972007179.pdfIn PDF document text
    • https://cooperspick.com/files/54742153882.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/jexaxujolubib.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/sitidugevi.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/40724035684.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/jexilidufagawoj.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/46aea6d90fa271f82a220b48ff47bbf3/80831468090.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/kavasuvusiresarukevelu.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/xitamogufukegaraz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=save+browser+page+as+pdfPDF 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_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 18116 bytes
SHA-256: 086d2ecfb5b9811eda0ad327ccaae1d32f77ab2d1206860e9508dd9a4a78b0cd
font_01_sfnt_off00011f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 10700 bytes
SHA-256: cd2ec88ff9cb3429d876a4ad49d5bdd62a881943b7d50de8d3f0de00b4c25ec4
font_02_sfnt_off000137d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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