Malicious PDF — malware analysis report

Static analysis result for SHA-256 42241d41a617312b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 16:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 312ccc11590ab90df6c273c5766b0fb3 SHA-1: 0375e0a446a3432cf501160980478b16f30aaa3c SHA-256: 42241d41a617312b8ac17badceb91d7f2cff93b92a080ed68e2e6eda717415d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document functions as a link farm, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://samarthanamparisara.org/apadmin/uploads/userfiles/files/wapami.pdf In PDF document text
    • http://savages.lu/imagesRTE/files/94008677095.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/teweponufigo.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/pekuga.pdfIn PDF document text
    • http://netart.hu/userfiles/file/6364701164.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/98272681594.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/foduvotimikud.pdfIn PDF document text
    • http://aquatherm-graz.at/files/90005922905.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/85397832576.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/34263869016.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/gezos.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/86430469858.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/zivinekuxuva.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/wesalurutezutakokadub.pdfIn PDF document text
    • http://kezmosas.hu/files/file/bezupokitorukujepesonuto.pdfIn PDF document text
    • http://melabo.com/upload/files/rolasoxejijusunuwapubiku.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/vubolotegubupabu.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/64651605342.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/pafukabodubobobuba.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/98805986603.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/10939034949.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021992237318228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=terraria+apk+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_off0000befa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFA 10128 bytes
SHA-256: ea2e98d07b9a26227e6e7a7d62db597dc95181b59d0432d35c35ba71b9dc9df4
font_01_sfnt_off0000d59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59E 16452 bytes
SHA-256: 57fb45ff9ce32dc3a0bf4c97d69b30015bb016c5dbe3d4a1227f09ef9002d4c8
font_02_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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