Malicious PDF — malware analysis report

Static analysis result for SHA-256 84aec08e0fcc5160…

MALICIOUS

PDF

71.1 KB Created: 2021-09-23 05:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc59c12fc7a9b0b1326b56dfc716fd86 SHA-1: 84db23e4d53b7f2565e4018183a5f4dbdae979dd SHA-256: 84aec08e0fcc51604d5a7bdd7dfe6fb3ff28f09f9aebb00d2eb5c7dd50b090db
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a callback phishing lure, suggesting the document prompts users to call a phone number for fraudulent purposes. 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 0.9965

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://gruppopolidori.com/upload/image/file/756488925.pdf In PDF document text
    • http://enotecagaribaldi.it/userfiles/files/vometufe.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/likosedawemoleb.pdfIn PDF document text
    • http://skncn.com/u/files/sosulokavuronobebefe.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/36797929438.pdfIn PDF document text
    • http://4bx.pl/public/file/gukefuvilalapuwuwunizon.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/12857996012.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/kavaxuwipetemeziwaponad.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140c42f178a2---10312663101.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d327c210463959a59de71cca0d706e4b/36141630129.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/zavopuk.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/66361790086.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/xudizeviwi.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/bewevatesebasixura.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/pijal.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/46333873832.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/43605106389.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/85910796033.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///pofakewode.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/43228401404.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/45568152675.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/49381079614978d62f2ca.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+extra+space+on+your+phonePDF 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_off0000b662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB662 15496 bytes
SHA-256: 236795cd064cafbbae4bd53207e320d00e4ae7dba252df1d340d1e944cff4158
font_01_sfnt_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 10908 bytes
SHA-256: 73e6fd5b4d5f8a0cdd7fa899c6f7f44d5789ba3c761a2c3db7452b52232a6860