Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ea0d2a87db48b2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 19:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f45408ea0578a2f8ca41bb262b5bcad SHA-1: 7779fe41baeaa37d7ab75e7045cd010ef4e51931 SHA-256: 20ea0d2a87db48b2de5fd1d8f3135008028c06ed41d8beaa8ee09579a14df6ad
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous external URIs, many pointing to disposable hosts, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and numerous embedded URLs indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://winstar-tools.com/UserFiles/editor/file/93243431104.pdf In PDF document text
    • http://haokunchem.cn/upload/files/vekon.pdfIn PDF document text
    • http://strap.sk/uploads/files/74386188381.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/vazijogejabutamekareno.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/24563395353.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/soluxalixafudoj.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/67258333814.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xuxujafupexofuzepojafin.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/roredidezotilakidujo.pdfIn PDF document text
    • https://drlanda.hu/user/file/3514218535.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/83931530871.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/vopufoxunugu.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/58032669529.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/juvenume.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109181619346597.pdfIn PDF document text
    • http://movediary.com/userfiles/file/16250991616.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/75019485474.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/fanemazo.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/53706582499.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/73203330974.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e0daaa75f2a7524f3f3685990db1d78a/xuzorekemufemofigudufi.pdfIn PDF document text
    • http://hiniceshine.com/upload/53786099045.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/62961234276.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/35948541282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+find+hidden+apps+in+xiaomiPDF 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_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 10796 bytes
SHA-256: 77711ecb626c3797cc90ac13610f4d93ebabd558bf9c7af0c73d7e9fbaafc0c3
font_01_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 17712 bytes
SHA-256: 5e525343bd52cca069bd757eefbbaae5f3d929a681f13e033823800f1b0f5cb7
font_02_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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