Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b40fdb2e32b193…

MALICIOUS

PDF

94.9 KB Created: 2021-09-24 08:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49ff22f414c9be094a24c420b297ae4a SHA-1: ab0f3f7770faf9aa0237c4d4e38bbbf0ac495c87 SHA-256: 21b40fdb2e32b19385aaddaa636f69743f0fa8563bc0e48a5e5feee412fc67e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://itineraire-consulting.com/ckfinder/userfiles/files/81983133875.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f3e0fc7235030edfb2580bb37d8124c9/70038975859.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/1996992532.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/dubajakaturelikudo.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/28987249135.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/soferizixukefi.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/85967486057.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/60285655518.pdfIn PDF document text
    • http://noithatvietsky.net/media/ftp/file/94867419880.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/81160935205.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/94843800160.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/ripizi.pdfIn PDF document text
    • http://mfcpavpos.ru/file/godakuladamepisel.pdfIn PDF document text
    • https://labelmarket.pl/data/file/gewupowugat.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/3272723057.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/30237318521.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/sobakoxenirosasulub.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210922213803.pdfIn PDF document text
    • https://webaprint.be/img/file/kivatoxuz.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/xolibazelukelejejedasusex.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/8881174803.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/debelij.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/forizoluborisisedipix.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/xixenudigixerel.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/siwadak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+feed+in+skyrim+vampirePDF 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_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 17436 bytes
SHA-256: 372d0c497547edaece0e62c5455cd13a48964d2a0dbea386b69f3a1565b7285d
font_01_sfnt_off00013bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15405 10960 bytes
SHA-256: 1167ca0aeb4bf9bd1f78650c1686f80958daa5784b805c341b28d0fc7f837317