Malicious PDF — malware analysis report

Static analysis result for SHA-256 3388db4176bfac12…

MALICIOUS

PDF

96.3 KB Created: 2021-10-06 18:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 46028c7582a4f7bc82673e4f53f3975c SHA-1: 6c5c48690607c5420bcbf1d9c4e18f6dbf190ff4 SHA-256: 3388db4176bfac1253341ded76f985de3f5d62d6d367dfc53508a0648b81f780
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing or scam attempt. No scripts were extracted, but the PDF structure itself likely facilitates the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aparcaderoshaddaichile.cl/uploads/images/files/zufinu.pdf In PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4ab63efbdd19cf676828c12a0b66d8e7/42617192971.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///joforufexunejerugoxep.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/59907604296.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/51402133396.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/lufagizanowol.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/fidikoruxakojop.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/kulafalabaj.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/lewivaxuwijax.pdfIn PDF document text
    • http://klenderbio.com/upload/files/2041845908.pdfIn PDF document text
    • http://hotechike.com/files/files/xumisivovuboletimebu.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/kabijakapota.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/38814211030.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/lidup.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/71069323129.pdfIn PDF document text
    • https://mikludava.lt/images/files/61897166734.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/18102518472.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/75450014667.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/620930390613099bf29063.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/lasazojodavawaxamelafafu.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/wudapojutana.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/32946001775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=article+of+dressPDF 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_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 20652 bytes
SHA-256: 72f853979224353cc3d1950e976bc1a8e5e9945485aba68744f48e98ef4badf5
font_01_sfnt_off000144c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD8 10184 bytes
SHA-256: 3c15340df4c9a79e0a6283797813a5ce2d84380a0242111ab15e4f70dddc85c4

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