Malicious PDF — malware analysis report

Static analysis result for SHA-256 032cd5f60e6eb35c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-11 18:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 8d25cd53eb94fc33ca5fe5d17e883383 SHA-1: 2550ffc432b4006f4bdf0c09487f15948323882f SHA-256: 032cd5f60e6eb35c00900407ec58a40483f89fdd28e1fa4853192d312e962e09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://cancunday.com/travela/img/files/nevakidugidu.pdf In PDF document text
    • http://suarezbeltran.com/aym_images/files/96201456891.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/36744c8fc81d2c30e10c4a0e349f99d2/nabivofiz.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/91669029287.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/dozolawawekifurapaloponok.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/73961647897.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/xoruwazatediwirelupe.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/31109627648.pdfIn PDF document text
    • http://myredm.ru/uploads/file/tobufukaxuxotijamiju.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/dodedepuzejasukoso.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/gegukokeveverujexe.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/zamejetewu.pdfIn PDF document text
    • https://go2germany.ru/files/file/43251369140.pdfIn PDF document text
    • http://vecsecity.info/editor_up/26436597907.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/171504518461335d43392d8.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e748190c3a406a69e06d5dbf3e4ecbff/japuzezomenuzisizalawubuz.pdfIn PDF document text
    • https://keongracun.org/contents/files/65032652531.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/960697019.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/pubiwazekelukide.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210907_9EF4A3237884FA91.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/63298087709.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/gekuremumoxokepujutidude.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/1352314973.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109101605449299.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/36932431845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+legal+itunes+downloadsPDF 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_off0000caf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF3 17760 bytes
SHA-256: a447c102c5f5d1189fa14f805ed9c7acb7fafaf96f68577736325994fb1deac2
font_01_sfnt_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 10588 bytes
SHA-256: 261cfcd30059e5263fe38d01e08d20fbf44d1ea0901fe172eee06fa5facca6cf
font_02_sfnt_off000111a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1