Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c0a12be7559e61…

MALICIOUS

PDF

90.6 KB Created: 2021-09-18 00:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 354ce76ab90630e90c1f668e3ddead4d SHA-1: c4ae5df24317003943686fc1f8711d6aa35cf944 SHA-256: 27c0a12be7559e617afa95d56bda4b23f3d85ac22392126ff733a41504140ef7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=blue+collar+comedy+tour+2 PDF link annotation
    • http://symbioticlifetech.org/attfile/fckimg/file///20210909145159_148584115.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/32378210430.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/5078909471.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/fosekapeg.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/32742285650.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109161222548404.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/visuvubudegi.pdfIn PDF document text
    • http://redactron.com/userfiles/file/rogemepanorazezufode.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131be01d34d5---betometuvinegetesudisune.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/99582603010.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/fovagepuxiletixevijuropo.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/57975499325.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/15269918510.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/96873543034.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/24843096855.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/98941445203.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/vumuxis.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/19222561913.pdfIn PDF document text
    • https://mbbs.hr/files/25696538718.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/puxip.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/28633826839.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/tumifekixabukivumigusewir.pdfIn PDF document text
    • 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_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 18092 bytes
SHA-256: 8ee87f6a4c06528bcd4133290927800d24ad65e4785a9370edf87b755c765a97
font_01_sfnt_off00012c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A6 10552 bytes
SHA-256: 23699478f0574b2942ee38350cfc5a640185416375c236b73bfc98a2dd008288

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