Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff180f09e630939…

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 08:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b90a1417b722694c9b1c6b0b41fdda9d SHA-1: bf2d5096a7dda50f7dd72459d3da116e104d5a56 SHA-256: aff180f09e63093967cf5334f304c043013fadbf8622b561af1d110c43b6a8b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, indicating an attempt to execute malicious code within the PDF viewer. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are unknown or hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://tkbhanna.com/ckfinder/userfiles/files/konow.pdf In PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/xonezetugozokotolelowizaw.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/18610951444.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210909091637.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/77077769605.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/11057794002.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/45779728270.pdfIn PDF document text
    • https://2winit.com/Files/files/47199767700.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/jevogil.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/28379975645.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/5996943538.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/40348460692.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/7663392108.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/61979683550.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/5169480789.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/59770929663.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/97117623487.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e52174838---33498725443.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/73432761934.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146bd33570e1---befifabexijarudotunixate.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/modoriromufedelanesat.pdfIn PDF document text
    • http://origo.ws/userfiles/file/92795146830.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/xetofojebibegobosukamox.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/paxisepika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+children%27s+books+online+pdfPDF 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_off0000b803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB803 15376 bytes
SHA-256: 9e8709ef7da25b5cab527186fee1a002885b14a778c77e62935b409db743c161
font_01_sfnt_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 10700 bytes
SHA-256: a637cd6e24784b028809a4214baefef27b014abe9757a2e432855ab00a7d50e4