Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acf817d20a95bed…

MALICIOUS

PDF

69.3 KB Created: 2021-09-17 20:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1f007988dfeaa612cb5249fb932676d9 SHA-1: 7cdd395b599c399a8fca7e74850bd15455eade66 SHA-256: 8acf817d20a95bed8249294e783acfa02787de579f581b2f4acf4a4c39fc5d77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions, and the presence of external links points towards an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://omonetach.pl/foto/ilustracje/file/nowiluzokazal.pdf In PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091312462880.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/11506723705.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/86418129908.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba71b02ef---buvonaradarod.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/zifugasoxo.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/23317928396.pdfIn PDF document text
    • http://oodow.cn/upload/file/210912011810400715gg7pz0j6kdpr.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/bukenexufodirobaparug.pdfIn PDF document text
    • http://metapolar.hu/tmp/75033123513.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/nupijanevakisuvo.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/49870018281.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/rilejeje.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/palute.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/51444732619.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/46594025182.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/50191083141.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/78540287438.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/roxelalolagidewejivuz.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/81005697482.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/tetalexajomolosokale.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/4455463962.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/66242127253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ninjago+shadow+of+ronin+download+apkPDF 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_off0000ae8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 10832 bytes
SHA-256: 2689276c91e4ab1cc8c727efb29748817b6873b17c4b0cf31913828af17b814a
font_02_sfnt_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 16360 bytes
SHA-256: 1c145bead2b21ccf209af0320f7ea744154108005ae71e58b3043f66b4aacc96

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