Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0748771414cce4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 22:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 261c89a6d214a869518dfe035d53107e SHA-1: 343f685f8b1acff3d23579bb9b6e45c1797f743c SHA-256: 9f0748771414cce476e86fd28c78404bf7fdf61cca102329dceedd66222a9b19
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF phishing trojan by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lead users to malicious content or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fallahi-sch.com/userfiles/file/figopasolitibamevusa.pdf In PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb01643b42---29240353053.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/99853787843.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/61176598928.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/54263739822.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/54251378712.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/xoperivijevinelitazobug.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/21573776546.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/10899720655.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/tatuwoviju.pdfIn PDF document text
    • https://ottopianos.nl/files/83207764899.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/36439394167.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/dexukonitasatoxefom.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/11/4831395465.pdfIn PDF document text
    • http://samtekelektrik.com/files/vujizoduzutig.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/1338882604.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/jixugisidexazuxejudilir.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/56196611938.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/tanufe.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/83104989672.pdfIn PDF document text
    • https://angkagenap.com/contents/files/pofitafetatenebuwuzos.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/xenolalevigemurinetazep.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19ac1f283---zukevurijopub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+check+ping+in+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_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 18156 bytes
SHA-256: 5feefc88fc500dd2e6df4f24d1a8788522358ec1c529465d263aca7f65d5a9d0
font_01_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 10748 bytes
SHA-256: 86e45bc0065a644f3fe15d47c077b0910f9a8a4eea9af593fab7474e18f9b379
font_02_sfnt_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1