Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba14767498aac897…

MALICIOUS

PDF

103.9 KB Created: 2021-09-10 01:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6864824056db467ea0a68274514bb51 SHA-1: aabf3328e478bc92554bafb79b15d0f10c37e66e SHA-256: ba14767498aac897e79b3d21aecd5a1069dc50a6fcbf8417333d5946e64bdbe1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_CALLBACK_LURE heuristics further supports a malicious intent, likely to trick users into visiting malicious sites or engaging with a callback scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=pathfinder+amulet+of+mighty+fists PDF link annotation
    • http://duoctruongxuan.vn/userfiles/image/file/rudiwe.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090710254073499.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xefilefowutexisi.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/vuxek.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68857311304.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210902_195458.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1f7cb297df5e47b7aa4e2e972cdc3e93/jaxukukibakijogukiniwik.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210910060242.pdfIn PDF document text
    • https://kawanmto.net/contents/files/xurazozifujuzarefuz.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/92594574247.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/32971693149.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/14111671179.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/sunixozisafi.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/5886154308.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/3955018601.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/82940359615.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021091005525268.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/pewazipegufojovoduxafe.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/lozovezijoxopomu.pdfIn PDF document text
    • http://goref.ru/files/file/5300733427.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/28999323502.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a620a24c77---delivijumegeb.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_off00012ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED1 11016 bytes
SHA-256: 8b0d32ce26a88659d8c8752a15dd0219bcd0aee87bf55c3d8eb74d1145aefb55
font_01_sfnt_off00014807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16019 18884 bytes
SHA-256: 32a665dc1a4fa627561698b9d72bd79895a4f4203948ce83d37d6fcc6ce5d4ef