Malicious PDF — malware analysis report

Static analysis result for SHA-256 9943b993fc1bd788…

MALICIOUS

PDF

83.1 KB Created: 2021-09-24 08:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27060fd97f63565f578db4c93c23ad2e SHA-1: f778ec8798a75c4d051bf424496a978c3ce8c321 SHA-256: 9943b993fc1bd78859c2d7f40ab696dd4f6d3df1bd8fca97d41df6d671c64388
154 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 by an ML classifier as malicious. The PDF contains embedded JavaScript and multiple external URIs, suggesting it's designed to exploit vulnerabilities or trick the user. The heuristic 'SE_CALLBACK_LURE' strongly indicates a callback phishing or tech-support scam, where the user is prompted to call a number. The presence of embedded JavaScript points to potential exploitation or malicious scripting within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://ministerium.pt/files/fipenif.pdf In PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/61791316538.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/24055862650.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/85100207221.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b09121db77---23216697702.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/wupojemeni.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/sejiwokabutizirud.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/nidosogujej.pdfIn PDF document text
    • https://lesura.net/userfiles/file/zogukasufovosil.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/jadonuv.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/11145965307.pdfIn PDF document text
    • http://huefpdf.org/upload/file/lobetaxafazajepolewaru.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/gotufilogefajonoguj.pdfIn PDF document text
    • http://prosquash.by/data/zumiwuxikewogenibive.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/40566079337.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/88049258427.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2e6bc5eb6c2fd7b25fb50e2f5348ea1/dunorogewuvigu.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/82949841223.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/baweburoditifen.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/47723692836.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/bonefoxulite.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/56749118661.pdfIn PDF document text
    • http://metallpress.info/files/96485870124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+gender+secret+pdfPDF 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_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 17896 bytes
SHA-256: f20576f8cdb056acd381342a1e586ea583507658a0c4eca7fecd937ca807de4c
font_01_sfnt_off00010fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 10444 bytes
SHA-256: 226db4bd743f7db270db0ddfad37de3995855bd5c5cf08ec56ce37b70a02389b