Malicious PDF — malware analysis report

Static analysis result for SHA-256 3faffc29cb138dbb…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 21:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e86f35148c745e87a22b59bd15328f95 SHA-1: 6c5ae8847ceb0a7fc1829d72e8ad7f22948367b5 SHA-256: 3faffc29cb138dbb9063e647c568f486af67672b36639d3dabef31dee208d2a4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate the PDF is part of a link farm, with numerous external URIs pointing to other PDF files hosted on disposable domains. This suggests a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://impactpluslearning.com/ckfinder/userfiles/files/99985099008.pdf In PDF document text
    • https://godahoian.com/app/webroot/upload/files/93355301524.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/646k4lhrq12u6dl29jm2kfrq4n/89834382026.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/kapudebu.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/78124539508.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/74534182477.pdfIn PDF document text
    • https://cargotavio.ru/files/file/musisi.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/bitovazuxawuforulogodad.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/zegavakes.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/xezimi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130703f00460---80504470412.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/tukesuvedirelosozamegewi.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/duveponixalefupovuwozolor.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/dabodibabusoparuwiruvomi.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/81081768567.pdfIn PDF document text
    • https://flyags.com/editorResources/file///48767210265.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202192115839776.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/68241645604.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/dalaxanarugubafegepomim.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109080409506261.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/82149086028.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/nabamilawerisalivu.pdfIn PDF document text
    • http://eichler-kammerer.de/wisofaxepujokuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+first+time+user+guidePDF 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_off0000af32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF32 16112 bytes
SHA-256: bfe867b106bf94d50efb154d172dbc81407706e6bfa67a6c5dfbe73cf3637f68
font_01_sfnt_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 10568 bytes
SHA-256: aa3b42fd15a975e25f770bac3d2997114f313654a3725800c0bb3b1b488f3e47
font_02_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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