Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae01d1bf3c0d8022…

MALICIOUS

PDF

73.2 KB Created: 2021-09-25 13:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd28b40aa04f6fd2f579cabcf819b552 SHA-1: c5864757978d22dcf900dc6564df4b33448d4f7a SHA-256: ae01d1bf3c0d8022f96a8eb9953e3c374fe3b036bc5299b5aa43dbda896089f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613341f6b07fa---85220720601.pdf In PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/xotunuk.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/kazenuti.pdfIn PDF document text
    • http://apvn.info/userfiles/file/38482704616.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/wumorikomuvuvu.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/56846547354.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae859ba999---rigora.pdfIn PDF document text
    • http://gro-felix.si/uploads/51237436647.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/83289359368.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/26606866880.pdfIn PDF document text
    • http://baoveantam.org/upload/files/71199999855.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/19817401162.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/52393504312.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/ridexumapanevi.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/wilevakowule.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090509011680554.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/96478367548.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/40386708086.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/muxomuvakejunufona.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wijevutami.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/navupujerajemu.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/zimusavavupun.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/60001372414.pdfIn PDF document text
    • http://vaynhe.com/upload/files/vagerasamovoratikudunoso.pdfIn PDF document text
    • http://fourfoods.com/images/files/bivunagarelasefid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=free+snoopy+wallpaper+for+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_off0000b73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 10572 bytes
SHA-256: cde07b1343c3430a98303da0ec60664c602506852cfec95c7fe30b2176afdd83
font_02_sfnt_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 17388 bytes
SHA-256: 49c481fc920702bb9eb82b75ac4b96d054f7bcbc324958b4d7108bc5ebac0530