Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2c97aa74477d3d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 12:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f5d7e0a4bafedfbad3a60a6a88600fd5 SHA-1: 7f0d6f79f134fb683d13e21f3227cb63f3374e7f SHA-256: 3f2c97aa74477d3db72e631181d283b5ae43d8033b2713404f47687fb48612af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured as redirects or link farms, indicating a malicious intent to direct users to potentially harmful sites. The ML classifier and ClamAV detection strongly suggest malicious content, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure itself facilitates the attack pattern by hosting a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=ha+tunnel+pro+apk+mod PDF link annotation
    • http://mannadey.in/FCKeditor/file/21000288167.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/33832573412.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/xujabufulinanesixozodi.pdfIn PDF document text
    • http://drtamerturan.com/file/64277294272.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/pedijitisujarakod.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/84926801560.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/40019867669.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/71174861100.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/wuvuvi.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/06/39016804426.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/47069075449.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/27869080106.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/fukipikeno.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/6691557792.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/5730374890.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/fejuriturijadasuxaraxisi.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/96936869691.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/76194945111.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/kiwosulalonowa.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/81634093937.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/kexuvokaxomazoxek.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/difuwaxekada.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/dezofi.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_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 10476 bytes
SHA-256: b410341f1adece30d91f598b071d534f3eaf72e7ab54ab088d22badfbbec6543
font_01_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 17580 bytes
SHA-256: f31ae8cff48b6c296b1f29dff5f98ab1976c621bc4ab421b4b6a2f505eb4e69a
font_02_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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