Malicious PDF — malware analysis report

Static analysis result for SHA-256 776e8235f97a5cd8…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 10:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb875cb4c239558831a8e85302a5448f SHA-1: c2dd165de4418b25ff52c00ffa9e51847f1f7f50 SHA-256: 776e8235f97a5cd8a74a7cdccb26acf3358cf7b14a3f731fe414b9e043e164a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution attempt. The PDF's structure and the presence of external links indicate it's likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tygodnikzuzlowy.pl/ckfinder/userfiles/files/babetuniwizezapelo.pdf In PDF document text
    • http://poliinc.com/upload/files/14473949109.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/lorasuzewirafilatutida.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/sifabofud.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/78971180036.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/6727870124.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/vewadud.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/2083279898.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d9ea0b817e41acd3d9eeaedb3f72408b/sareja.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/musowarani.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1aec6a20d---68520032240.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/67689089490.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/piwomivel.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210910190400.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/tufuwisusir.pdfIn PDF document text
    • https://securitydm.net/slicice/file/dowiwolekariroja.pdfIn PDF document text
    • https://olterus.org/contents/files/13658037472.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/76174847266.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/63167835171.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/69403806101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=death+on+the+nile+streaming+vfPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/jesim.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_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 10728 bytes
SHA-256: ad138bd7061a6964fde96bc4d7488896b1bcc5131fbdc0f9820cadabf0c062e2
font_01_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 21120 bytes
SHA-256: 216ec9edcd60c7b7997a5e1df8cebea1c85766d8e880800f9dedbfda643983b8

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