Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abd2d8f45828d4f…

MALICIOUS

PDF

96.1 KB Created: 2021-10-08 23:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 08d7f7ba8dc73acc29740556c39e7572 SHA-1: b39826ca681f57bc4693fcf43265a930c1407033 SHA-256: 3abd2d8f45828d4f509d13cb21180842137b2ae028fd7b2cfb072f570e751ad5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to direct users to potentially harmful sites. The presence of embedded JavaScript indicates a potential for exploitation or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • 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.
  • 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://s-serviss.lv/userfiles/file/86150107757.pdf In PDF document text
    • https://siltri.com/fck_upload/file/powulibidupimipipasakufa.pdfIn PDF document text
    • http://sayarbobinaj.com/file/nidem.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/zawasi.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/23174029417.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/26632211819.pdfIn PDF document text
    • http://videlec.be/ressource/file/nejawopadunitej.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/47462272717.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/35618743875.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/wowuziti.pdfIn PDF document text
    • http://muszempilla.com/files/file/11137638732.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/dewamumezajo.pdfIn PDF document text
    • http://otoform.com/upload/ckfinder/files/28652740835.pdfIn PDF document text
    • http://rld-carbon.ru/file/71406835414.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/zoximotitezowovurozewoj.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/84337985043.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/gawab.pdfIn PDF document text
    • http://christopherdallo.com/file/49552785971.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/44502325605.pdfIn PDF document text
    • http://partnercable.hu/files/22615144525.pdfIn PDF document text
    • http://chayka-svg.ru/files/31716612323.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/53811037610.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d415019a88---68517094511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+many+eyes+have+a+spiderPDF 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_off000110a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A5 10768 bytes
SHA-256: 8c8ff2a89dc50b85ae8de1fa65f428fdced8f9a4abab0e97c53df649088b2357
font_01_sfnt_off00012935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12935 19164 bytes
SHA-256: 9a8f7ed1b5ab71f7ff75f267d4b29ac770b78fa56796d225ff1b5ac01ac0948e
font_02_sfnt_off00015a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1