Malicious PDF — malware analysis report

Static analysis result for SHA-256 e708e5be7d01a907…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 15:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f46a4051fe487cd201253dedd1746a3 SHA-1: 5fe833b39e92d360f73b6ce60c13157274c67594 SHA-256: e708e5be7d01a907765f0b1f1c57417346cd96b4990101181d9e04ac2cc11d7f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely using a malicious PDF to deliver a payload or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://archinfo.ru/uploads/file/42764514521.pdf In PDF document text
    • https://thefertilizerproductionline.com/d/files/7072769603.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/70134718501.pdfIn PDF document text
    • http://trovas.com/userimages/31466137566.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/liwozigumajodasafosizaso.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/51154870733.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/togawokusimonaw.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109010150084665.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/lasezupololanexazo.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/visesasodufibunuxomuxi.pdfIn PDF document text
    • http://abnicum.com/files/file/wijowekize.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/xolujowi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2275c247f---vigog.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/80048347277.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/pajawovigax.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/dujiludezizafazurenev.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/37840650360.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/dabaxawolezi.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/78803350749.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/40553130891.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396c94a1e0a---76340467901.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/lawixasagikowonolitulotes.pdfIn PDF document text
    • https://attack.lt/images/files/98186165457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gta+v+android+torrent+magnetPDF 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_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 20000 bytes
SHA-256: 9f7c864a78a5e7a13b00cead591751d87990dd0532e705f1a51b5c1d3137754a
font_01_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 10484 bytes
SHA-256: a18eb30d84fa0dbe4de7f5b02165e62664fc1c326cad1a60a64b753b9914d82b
font_02_sfnt_off000138bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1