Malicious PDF — malware analysis report

Static analysis result for SHA-256 863a04a5753be007…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 22:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95dffa48321ebaaf437c5257eb67ebe6 SHA-1: 15484be6614c4b55a7a96af886f2750ec1ae7329 SHA-256: 863a04a5753be00720889a074d19b39018fd7f6e78189d1ac3c154df018996bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While the document body is heavily obfuscated and unreadable, the presence of many links suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://quincy.pl/ckfinder/userfiles/files/90990976420.pdf In PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/wetetu.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/42260268844.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/59946432340.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/64899588767.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/lanivugeligobekamo.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/wavomitimeged.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/larudipiragaxumogotu.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/5190089433.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/38197527237.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/51666705569.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/vurese.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/32869870257.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/wukug.pdfIn PDF document text
    • http://heizler.hu/files/file/tejibuliretelaxusol.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109111044354547.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/zodiz.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/fadedowoj.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/43581290049.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614220ddbc3aa---75876553480.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/68489530946.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/jafosatupaleju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=batman+telltale+apk+filePDF 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_off0000d59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59A 20172 bytes
SHA-256: ce7d913d988a129215a84fa36211eac7195788025dadb3cdcd2af260cb32b7f7
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 10276 bytes
SHA-256: 093d155a4180cc5a75f975a3970a791bce9ad0f14d4799515cd120f3c96b3128
font_02_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.