Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6a3b8fd312831f…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 20:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 361f0e7967a693a240ebf8412ced7a04 SHA-1: 2b6c33af1aa57757c25e9c2e3957621abae0ce41 SHA-256: ee6a3b8fd312831fb66ebbb59235d94d6d774152ab6582783d9c30004ca7445e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and a callback phishing lure. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely for phishing purposes. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://habrit.tw/ckfinder/userfiles/files/64022525070.pdf In PDF document text
    • http://hidropro.hu/upload/kemamu.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/lidexelerofi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/91173bdcbd2e33dbc87f1d9aa0e649ca/fogexere.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/86224797446.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/rajenofemu.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/niwiwebanejiriz.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/tumubibuj.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/8310822547.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/gijifixuwo.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/gufobezitajex.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/sazotes.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/netimegexa.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161301a86f194a---62929580424.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/13400688098.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-21/20210921205844204308.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/52438974685.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/tumimobijonabezojekasiv.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/15330067972.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/15059220722.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/xufemafudulijak.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/93963267577.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/metisunawinizonom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+how+to+check+time+spent+on+appsPDF 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_off0000af44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF44 10892 bytes
SHA-256: d77e0b52e173f685adefa5182796ea809466e133a274cd14ed931b44f134be3c
font_01_sfnt_off0000c85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85E 16412 bytes
SHA-256: d445c1adf540beb88412ecb47fb13ca1a154c8f8bc672d157ba52d9a3702bd36
font_02_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1