Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e88f541cb5ba82…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 15:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85d4ae97f53a794dcb2dd97d6c7bf8ee SHA-1: ec9eab90a99e37074e9cf32e1a35da6a183182ab SHA-256: d1e88f541cb5ba8204ad4297fb5afa9d4ce842ac0f0bc637e3fab7acdaf14511
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics, including ClamAV and an ML classifier. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam by prompting the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate it's designed to lead users to potentially malicious content or services, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gongotour.com/FileData/ckfinder/files/20210910_11298D9D3F61B2A6.pdf In PDF document text
    • http://avon-bratislava.sk/files/files/43806207682.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/kemoj.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202191101041.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/65673342751.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/50955472846.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/29213589040.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210911024755.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/gowegiga.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/wizadovirevudosiz.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613360ee32165---sekazozudowe.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/mosigagiroladix.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/50866517319.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/21919427703.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/1403434199.pdfIn PDF document text
    • http://bdsductri.com/upload/files/44426671738.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f80ff1b92190a24778ec5a7d93a9c55d/xunegevemevufutegije.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/witigeditoxagijonoxajomoz.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/jonobigapadosin.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/28108408511.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/xoxedakaximugatozuma.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/kafidalil.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/nulidimadetitesejixe.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/41255686884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=apps+like+avatarify+androidPDF 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_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 18444 bytes
SHA-256: cc6a9b4ec3bfdf1c0dc3b9858fe1dad8f7f79a82e9773713c6cd2ea06c6e6b2d
font_01_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 10744 bytes
SHA-256: 3a245a2c76b7b866b9e7195034a9d3a7d16ef980e931e537d5ef6d347955241f