Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d03aa9729b0fd74…

MALICIOUS

PDF

95.5 KB Created: 2021-09-13 19:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6a0eebb609d61df70f188cc202a40337 SHA-1: 5a4a22dc635fd220de399804fb4abb61310cc82c SHA-256: 7d03aa9729b0fd74106508cfef8eefc1f3e7d2692bc3e17343a7a856512f3b66
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains embedded JavaScript, indicating an attempt to execute malicious code upon opening. The numerous external URIs, many pointing to PDF files on various domains, suggest a link farm or redirection mechanism intended to lead the user to malicious content or further stages of an attack. The presence of embedded JavaScript and the overall structure strongly suggest an attack pattern involving the execution of malicious code to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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 https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613624b152ba2---vikomo.pdf In PDF document text
    • http://pegastelco.com/pictures/files/31809646169.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/bubawoli.pdfIn PDF document text
    • http://espwireless.net/uploads/file/42967138169.pdfIn PDF document text
    • https://kiptep.ru/file/wexilimabesoxafefusegod.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/wavixekowubid.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/muvivabolagalunebibos.pdfIn PDF document text
    • http://www.moyekolodin.com/files/72252283947.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/dejuletavamimurereji.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/girefupidosuxewetapara.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/sojexifiraxibajat.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/56289588634.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/fejor.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/ditabunaguni.pdfIn PDF document text
    • https://thehouseproduction.net/file/melewivomo.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/40926512527.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/babilixuj.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/kawutesimivodidobag.pdfIn PDF document text
    • https://ibericadearmerias.com/file/48262037340.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/66776365676.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/vugibazipetazevi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6c415e79c2cfc625939cdb3ac707c899/72848622421.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/55250224709.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///ditamamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=getliker+instagram+followersPDF 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_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 18484 bytes
SHA-256: 43d346e8f7cb8525049584e270d195d9cc933e6bd99a506877d7f9eb1a2743db
font_01_sfnt_off00013ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001570f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570F 10772 bytes
SHA-256: a912e9a46ef6c3f420255e399b69076465c9eb48027ec833e2f68a7b1134b441