Malicious PDF — malware analysis report

Static analysis result for SHA-256 c748fc3b875a2e97…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 02:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b77831841b2743952bf64b4c3f14b44 SHA-1: 89e7672c93388eaeea3ec5a9fff6ca35702990db SHA-256: c748fc3b875a2e9781ff878c314939cbdd4b40ae59c3b7d024950e49ce743470
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or low-reputation hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

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 https://smidgel.ru/uplcv?utm_term=shivaji+full+movie+in+telugu PDF link annotation
    • http://rovitek.com/userfiles/file/16717528572.pdfIn PDF document text
    • http://tianfonmm.com/d/files/79991587129.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/nidekuwexubukawevosew.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/65796960421.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/xepawegovuf.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/kelixojodagulajoridijimep.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/59441497013.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///16072449811.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/589602509.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/xonux.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/xujibel.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/wafosajoresadugi.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/jefoponegekini.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/22855879012.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/1128072640.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/18001779548.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9ad6ccf3eb54d2d9b23618a3fece707a/52629474457.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/70334335821.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/28818902887.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/3539915740.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/19295136551.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/c128doqor3bda18hq98di27jlh/femameguvijevefakinegiwu.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/33196993775.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_off0000b5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD4 10764 bytes
SHA-256: ea9402b311651a972c45f9177384008db0d0cf2b8907a35dc48fac55d0264b02
font_02_sfnt_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 16404 bytes
SHA-256: 5788711bee1e9b89c373d8cf982a749c096f91d982b552693e2f046671e59838

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