Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfdbc68d5f853f1…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 06:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f08e4de8b3d714c243a5870d290ba73b SHA-1: c071081067868e09bfc49ea2e947ce1b63b95cdd SHA-256: fcfdbc68d5f853f146850bdc9ab1f92b8742537004bfe911f1d340371e0aabf2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs and the PDF's structure suggest it's intended to redirect users to potentially harmful external sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions, and the numerous external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=is+there+any+way+to+recover+deleted+photos+from+android PDF link annotation
    • https://emenu.hu/editor_up/zukugozonegimawoku.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/xiwog.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/23848839683.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/48680437355.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/guxijixijatejabem.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/lafukasikidikawi.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/nazodesevizagagaf.pdfIn PDF document text
    • http://schokobrunnen.com/idata/48601472207.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/moliwubemeva.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/jukiw.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/8678226439.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/rinixa.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/pebefixulopesovajibuluxuk.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/44091493111.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/felafapivozodejobobid.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c77d02cbef403cd3d20a2d367debc837/ligowipegazigi.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/57203507435.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/98170814365.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/82404978842.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/65516356683.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/watotekelijalazatodebetog.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4v8o1qh8hg1f7o2lkharmgbdcg/90528438043.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/54960353260.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_off0000c95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95E 16836 bytes
SHA-256: f1976c57c0589cf22d758dd6812317b05209ff777632a9f13eda0f928ac27515
font_01_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 11100 bytes
SHA-256: d1b53a2a97c9e7d6d0fd0aa66edc9275f2dae704090bfb6b033f6236550567ba
font_02_sfnt_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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