Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f9f3aaae599d5b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 15:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43d17b73286d4f5dc2c32dc12e2bb9b4 SHA-1: 91f14ce2719492ce36c1b6da42002a511f5180b0 SHA-256: a1f9f3aaae599d5b561557c5b4bb8867f817fbd1c5794a3b44b1e341683bada9
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and a high ML classifier score, indicating malicious intent. The presence of embedded JavaScript and numerous external URIs suggests the document is designed to exploit vulnerabilities or redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the user is prompted to call a number, likely to initiate further social engineering or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=is+it+possible+to+transfer+data+from+android+to+iphone PDF link annotation
    • http://hyeminshop.com/DATA/files/nozevaxabam.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/18548830731.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/gimomoxofozugidonugike.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/kidarolimefurojibumesafi.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/75338395946.pdfIn PDF document text
    • https://maviet.vn/upload/files/23899718907.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/babiduxiladamevudotajaw.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/50315311620.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/febibu.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/38024144340.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/kafekidatopokepis.pdfIn PDF document text
    • http://aurora-c.jp/files/files/16928253778.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/tefesodonupojojalanirov.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/42786134483.pdfIn PDF document text
    • http://polletnv.be/uploads/files/sonitaritogawaxofi.pdfIn PDF document text
    • https://eclearusa.com/images/file/vamodowusuvox.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/37937994327.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee62592e90---61185483990.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/86986255984.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/80270757810.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bulotalosiraxonowe.pdfIn PDF document text
    • http://midel.me/userfiles/file/niperelitipatumumisa.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_off0000aea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B7 10856 bytes
SHA-256: afa953403c5ae213238fe517e9db7c023521d1f1dd83fdae591a53313c8507ed
font_02_sfnt_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 17240 bytes
SHA-256: 3f3394089f6251df0d589c1edce94a8c2fe2e66c600f88d4bdb2d405efb40141