Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb5622695690819…

MALICIOUS

PDF

70.4 KB Created: 2021-09-23 19:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5c4e21327b5ae3de084b8f4ca434233c SHA-1: 442b42f83ea619829e1c5a976aea143adf6f710e SHA-256: 2bb562269569081941897cbbd940ceaa84ffb3ed42a60cecebbcf75e0847109a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, with one prominent URL suggesting a lure for 'instagram private photo viewer no survey'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting a phishing or malware distribution intent. No scripts were extracted, but the overall structure and URL patterns strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=instagram+private+photo+viewer+no+survey PDF link annotation
    • https://dananeye.com/uploads/files/202108312306595679.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/sanurilujazapur.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-21/210921183621990722t1s9uhgfpgku.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210923_D53BAD590510B026.pdfIn PDF document text
    • https://lapakunited.com/contents/files/41598544781.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/88515423076.pdfIn PDF document text
    • http://lex.tj/img/file/kekizurofibatenavufilil.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/12256224145.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/jefobu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/73189921630.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/37250423038.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/16435345644.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/34198792172.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/24893928537.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/wobimagesev.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210910012418.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/73985140854.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/xetotebipalon.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/20983024437.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/zujamefubimojimepetazajuf.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/2755251830.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-3/20210903142830565242.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c87d9d88d719587464ae1c92fad1402b/78399070369.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109190606129439.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_off0000b52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52C 14860 bytes
SHA-256: ed0057cb76843d337e83b7dc78863aaf1647967cd6fac53d723a90453b5b0e44
font_01_sfnt_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 10968 bytes
SHA-256: 50f9432f7d68950a843ce1e1dd8ae91f76104390c0c6a73b52dc372825f06e0f
font_02_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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