Malicious PDF — malware analysis report

Static analysis result for SHA-256 0522a996b53e6489…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 13:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57baa8e82ce121e7515affa86086f5dc SHA-1: 0f6d3d58c0cba1b8f626dacbc9139f9c4dee9198 SHA-256: 0522a996b53e6489200135e03e5f377a0471de15186ec756428ab224d1053b6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The PDF structure and numerous external links suggest an attempt to redirect users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://beldaoyun.com/calisma2/files/uploads/90723583231.pdf In PDF document text
    • http://kovofilm.cz/userfiles/file/10643103082.pdfIn PDF document text
    • http://patroha.hu/file/baxulileri.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/xuvupixi.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/laborif.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/95138492004.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/73961677003.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/32514382426.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/dodefujenosodubaguvasokum.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/gomevulavawepopetod.pdfIn PDF document text
    • http://midel.me/userfiles/file/favafufever.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/36845158235.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/95121601746.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613292e09e1af---9549491607.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/robaxanowilenel.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/11626153153.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/98972131507.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/12173231941.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/bipelonep.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/vofetejubobonejip.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/76690113137.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/926137044.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/ladiwemevepal.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/60126779096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=texts+from+iphone+to+android+not+workingPDF 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_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 18204 bytes
SHA-256: de5dda65d66fba58b62860be4355fdc8866db6e60a758a9135741b0f99ebbd60
font_02_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 11144 bytes
SHA-256: fe5960465f814e267668a5ba2e3aa3e32c315d628480b52db3b18155ad00db49

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