Malicious PDF — malware analysis report

Static analysis result for SHA-256 1708082abf9cc209…

MALICIOUS

PDF

68.0 KB Created: 2021-09-17 08:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c3a346fdfbbb4675b325e7541304830 SHA-1: 44a782ea86efde489ec0d6ab60f762d44cc88ea7 SHA-256: 1708082abf9cc2092d225f701232b95cb72717545f86070e0feb7161d9ab0f6f
146 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including being image-only with a click-outward action and a small file size. The presence of numerous disposable links and the ML classifier's high confidence score indicate malicious intent. While no scripts were extracted, the document structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://sineadstone.com/userfiles/file/39755943260.pdf In PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/makovuxodonelefudeneme.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/mevikafelavobe.pdfIn PDF document text
    • http://juentai.com/userfiles/files/19058464709.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/xuvovigixitudap.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/netugap.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/44611462974.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/85173120891.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/wexegabulemesigukelafub.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/16781717642.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/17139422791.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/wadujonopidivem.pdfIn PDF document text
    • https://edex.co/userfiles/files/losutafenupurokigatekapo.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/satawugivoxovadamidatimum.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/070117424613.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/36731607233.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/28302835291.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/vasinovitomefanuti.pdfIn PDF document text
    • http://gr-chem.com/upload/files/vopaxazu.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210906201208.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/52805250270.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/46247244362.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/19679729868.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/96139677280.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/68640929062.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/48789482799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=physics+ocr+a+level+equation+sheetPDF 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_off0000afaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAA 13744 bytes
SHA-256: 4d53d3e05f8fb353a3f188f1ea75c84fb78780ee78383f86655a94c9ae5e5c9b
font_01_sfnt_off0000d142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD142 10756 bytes
SHA-256: 471be0584586f0a1a972c5594446f4a17880633eaae71e934581e6a2bcdf3b12
font_02_sfnt_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1