Malicious PDF — malware analysis report

Static analysis result for SHA-256 76af887f16ae14f6…

MALICIOUS

PDF

88.8 KB Created: 2021-09-18 11:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6ca6c3213713c8645422f773cfbdeb7 SHA-1: 311cde7e4d21299a9eec818deb87ed8edb957018 SHA-256: 76af887f16ae14f68be67d2116e36f7e540956d9f42edfe2330708ae8be26449
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the presence of external URIs and the link farm behavior points to an attack pattern involving directing users to potentially harmful content.

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://coretry.ru/uplcv?utm_term=router+hacking+tutorial PDF link annotation
    • http://tscyw.net/userfiles/file/20210915220610_zmz8ip.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/50834686715.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/45904459053.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/dufanobezegarenomes.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/37209662465.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae65b1ea7sact0ir1u7a5rkv1s/47600313434.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/denapifivofigepexeke.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/91044562501.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/zapasepidonale.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/98285955965.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/jetikogenimegu.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/betogo.pdfIn PDF document text
    • https://iohrp.org/f_files/files/43237791543.pdfIn PDF document text
    • http://kgmda.com/upload/files/87145361036.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/xujabuzaju.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/5789389343.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/84746933048.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109030512321959.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/17625777663.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/5116925429.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/xaxisupakege.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/30681624354.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/24683344151.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_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 19904 bytes
SHA-256: a8dd132712d6582730c6ccf46f4876444d12ca5b5304a1ab07ea4ffc31380d1a
font_01_sfnt_off0001254a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254A 10580 bytes
SHA-256: e11edcfa9440c8f10661b4e928d093851c0aa86be3a7efad828b87c0664439b5
font_02_sfnt_off00013d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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