Malicious PDF — malware analysis report

Static analysis result for SHA-256 22525a75da857d02…

MALICIOUS

PDF

73.7 KB Created: 2021-09-13 08:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc5d0b97577cfbb1ac3d39cd90c31d0e SHA-1: ede09c3bc8a56f476df2bf33dc31aef3879952fe SHA-256: 22525a75da857d026b29a88a6f98b99f3a5fa0fd7ce29dfbdf33915cb0bb89d4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the document prompts the user to make a phone call. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://citadelcaralarms.com/userfiles/file/82111942701.pdf In PDF document text
    • http://dj-maily.com/uploads/pages/files/fodokuxego.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/10069689821.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/86827798181.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/89186732070.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/fopag.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/xavegifaju.pdfIn PDF document text
    • http://soles2walk.cz/data/file/91761025373.pdfIn PDF document text
    • https://svltv.in/userfiles/files/motebesanitifaxofagur.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/2780845385.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/56617453834.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/96982391742.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/65532621900.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/54432499926.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89144538747.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/490fe0c282a0393435e859a8e4b62dae/26033361342.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/xurewakotutufobupi.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/78758692034.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/fuzapasimabapekavuruken.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/pimukefidax.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/dubolizalurijubivimil.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210913_125246.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/20512768905.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/rusizo.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/19588071180.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/70685797134.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/74863321939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sully+2016+torrentPDF 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_off0000bb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 17244 bytes
SHA-256: f8ef1ca4f0cf44bbd8ab9b71bb6c19274759c42222877ef5307ba6e018f26057
font_02_sfnt_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 10428 bytes
SHA-256: eed3e26389755479164c2786149121d9f97f6b130e239667696c4a1f283f3323