Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c96dde71f1a1cd…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 20:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0ed33107f83fa94254cac41cdbc9c391 SHA-1: 25fd0ed1ca56480e960d4ae8facc354a74986911 SHA-256: 75c96dde71f1a1cd3bed41942394196f23405c9b5f867ae5611f39daf8656c8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm structure, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tjsyjdq.com/v15/Upload/file/2021931111116592.pdf In PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/31080061422.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/56178868007.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/nosevamepajometowegerire.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/54429288000.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/ronebakeradododajale.pdfIn PDF document text
    • https://aashianarealty.com/file/800876088.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/35866026682.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/64646434480.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/lekesom.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/wusimunexuxukepog.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/nijikizugorogomizutiziguk.pdfIn PDF document text
    • https://terracell.pt/images/file/48100784419.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/92480913204.pdfIn PDF document text
    • https://rafautama.com/uploads/file/14457121748.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/96728830434.pdfIn PDF document text
    • http://oris-am.com/editor_up/41048170525.pdfIn PDF document text
    • http://millecolori.it/images/file/79544172912.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/6189592876135fd05587ea.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/58637614540.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/bodivusopaxuwo.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/65910099948.pdfIn PDF document text
    • http://partnercable.com/files/84463016017.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/19632516706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=trucos+para+gt+racing+2+androidPDF 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_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 10696 bytes
SHA-256: 9770919f5c7233684eef7f66287e7a22d891eb51b838588a93c16e404da1f71e
font_01_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 18276 bytes
SHA-256: 399f70c83eea5c6fd7c1acbcc3831c695236f95a9f4110e91310e07a17e4cedc

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