Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c237adc751b7f8…

MALICIOUS

PDF

76.2 KB Created: 2021-09-10 16:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6f1f43ba3238a09a8f35c6b8ae55bbb SHA-1: 934acbaeec9c60ee518897a89df15c44513dd7d1 SHA-256: 81c237adc751b7f803e4236b946d405007e5503483e485d4e5c18db2189e4f61
194 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicative of malicious intent. Heuristics strongly suggest an advance-fee scam and a callback phishing lure, aiming to trick the user into believing they are owed a prize or need to resolve a billing issue, prompting them to call a provided number. The presence of ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 http://avon-bratislava.sk/files/files/93827797476.pdf In PDF document text
    • http://asiadomainstore.com/userfiles/file/sedotidorosisugugelax.pdfIn PDF document text
    • https://angkalaris.com/contents/files/7250974479.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/25825827817.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/favorafedivojebusaxemiwu.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/dozava.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/67221207497.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/zugefopezitemaligaxa.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134addf37613---60364192571.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/74713794268.pdfIn PDF document text
    • https://ever-progress.com/upload/files/jimobenixaji.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/36611782929.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109060402283207.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/zanuveledobonefudogobuju.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16133b78a780b4---xudaso.pdfIn PDF document text
    • https://granitnet.hu/editor_up/dozev.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/3975052371.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/74209409129.pdfIn PDF document text
    • https://kimcert.org/E/file/55791858676.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/bizoxoxedutibef.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/42661571534.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/44205533889.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/lapunewimawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sbi+mobile+application+for+androidPDF 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_off0000c412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 17920 bytes
SHA-256: 9d8e582982051593ce50eb0c3839060b2f8af86868408b29f88d3d028e238bbb
font_02_sfnt_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 10828 bytes
SHA-256: 4db035c325d036a460fdab57620be3877b6486347bd1e6301a151b4892215875

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