Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b525b6737e34ea…

MALICIOUS

PDF

71.1 KB Created: 2021-10-08 01:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 23f5b7cc64237a160458c7b4a470eed4 SHA-1: 882d87d16f42d94239e0090cf02f7105565dbca2 SHA-256: 56b525b6737e34eade9f7e87626b891cd6f36123255b7633ea5b53f8a0eba8c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a number. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a lure for further social engineering or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://smidgel.ru/uplcv?utm_term=grilling+spare+ribs+on+charcoal PDF link annotation
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/padivetetaz.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/733301592.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/68063739725.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/veweniterozagamagenekodob.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/wejaremefuno.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/7832621610.pdfIn PDF document text
    • http://llux.vn/uploads/files/72168494429.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/7796381032.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/kilobolilugibukutilajipa.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/98986627907.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/sekumopewugavikojalanime.pdfIn PDF document text
    • http://grotech.in/userfiles/file/99659932899.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/guxomuraza.pdfIn PDF document text
    • http://peoplefineart.com/assets/202110/files/20211007182519289727.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/70751580697.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/42752000663.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/faxoselekexawudeporotagiz.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/64fea8bd522e3cad95a83756d981ec01/jidelubulit.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16153bafe98a3d---81299446203.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/12355187952.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/zutowekaremixalotalifumif.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20211003_4942F9589B63AFE5.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/kaviz.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/21116755691.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/suvevaxelun.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_off0000b544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB544 16208 bytes
SHA-256: d208f89552a1b5fa1fd6e40164641ca426902b3a2eb596dbb318bf36b265f726
font_01_sfnt_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 10736 bytes
SHA-256: c83f3f4772a63782a7d46081d43132e72d5800478d34fd59f3a95707f9208380
font_02_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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