Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3132d50a6c82cd2…

MALICIOUS

PDF

77.0 KB Created: 2021-09-11 14:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a898cf19539152f8246cbe2ac4f5550f SHA-1: f25a0d39380b3d72096694da59307ca13d41eede SHA-256: f3132d50a6c82cd2ad70cce415f4b64f32090d392a88080ed14e916d384d394d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. Heuristics indicate it functions as a link farm and contains a callback phishing lure, prompting users to call a number for issues related to billing or security. While no scripts were directly extracted, the PDF structure and associated URLs suggest an attempt to redirect users to malicious content or initiate fraudulent phone interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://accesoriosalmayor.com/images/userfiles/file/49539562703.pdf In PDF document text
    • http://metallpress.ru/files/91242643877.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/melef.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/rulisox.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/91446035581.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/xekenijijofit.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/sonok.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/digoxuganuvon.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/38562925802.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/44250373328.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/kusowogitixi.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/fajeru.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/zavesawemebojewulapir.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161370c217676c---mexagidefo.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/70292555600.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/95852733133.pdfIn PDF document text
    • http://goodmax.ru/i/files/papulumuxam.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/mosefixesewuzo.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/43721996315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cheat+ml+battle+pointPDF 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_off0000c8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 17976 bytes
SHA-256: f879836ebea151d6fc311fd9b14fe43136d4571c51e860049c9dc69c611b07ec
font_02_sfnt_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 10420 bytes
SHA-256: 09a9bcbda150f39cac2370e10070b9f26022aee153e0191c315b8205b1474deb

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