Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b53f4a3a924bda…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 09:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 69987a6171899856696754d3fe83fe30 SHA-1: 68b4e70ab900609c692ddfad1786734a3131caae SHA-256: 96b53f4a3a924bda69ccaba06884ab6553a80504906010d9cecd548ee59d97ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=sunny+leone+new+hot PDF link annotation
    • http://lso-msm.com/userfiles/file/30831575391.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/leroromewavenexe.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210904/2109041531095462350iyh16w3fl8s.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/fosulamuvopu.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/78596336085.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/34642655605.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210910211106.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090514481283.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/tagamirutumojuxeriwodud.pdfIn PDF document text
    • https://salwangurugram.com/files/razixu.pdfIn PDF document text
    • http://biosite.ru/images/news/file/60480096023.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/9119661704.pdfIn PDF document text
    • http://pi-consulting.ch/download/fesitawupinep.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/napegutikalefuv.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/dikabetoforud.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/55421710771.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210918_115550465D869898.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/vadakifajomeri.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/74472673202.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/bidizogetemonawetopasev.pdfIn PDF document text
    • http://wdnederland.nl/file/zapizukoxijozofujamireki.pdfIn PDF document text
    • http://momsystem.ru/public/file/89706485489.pdfIn PDF document text
    • http://woykoff.hu/upload/file/xoguzowopuvizo.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/woxikafurusajapisubus.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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 10060 bytes
SHA-256: 59ac94390f5471be2d6ef1e0f5d99133361e3de49e1806948c34e260b8521a83
font_01_sfnt_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 17884 bytes
SHA-256: 2f7b6b115cef0eb26e59293d3ab9b7dd3e75411c17b973d645d891ba5d8b3fbe

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