Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff3155cd8d80163…

MALICIOUS

PDF

74.3 KB Created: 2021-09-12 20:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bbc42289f50e131bce9c0941f323d428 SHA-1: b2cda392a960be660cf9bf576f26b44306904423 SHA-256: 5ff3155cd8d801632b1a9f12410e99d5bb80a84d4269a1785b11c203b459bb85
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The high number of external links, many pointing to disposable domains or using UTM parameters, suggests a phishing or redirection scheme. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://myshiou.com/uploads/files/202109080217552652.pdf In PDF document text
    • http://zit-tech.com/userfiles/files/68581796500.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/linujebexukutisibo.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/pagowi.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/lolatefedikufirezerajo.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/rotitavarumavipexow.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/bokogekividolijafoluv.pdfIn PDF document text
    • http://liily.jp/upload/file/20210902081432.pdfIn PDF document text
    • https://stotex.rs/files/54054138688.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/vegif.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/rufifogotevajekufajeles.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/45513331889.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2e2576c85---losagobigusodajolek.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210908_F033BA6593C9E065.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/65474634743.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132609c9d29e---93210686660.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-01/images/files/55835398300.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/59795941555.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/vojuwukokovimajagutu.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/wisirebukom.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/94074792406.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/14636976702.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/dilazesamemilifaxeliped.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/48161673025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=social+media+connectivityPDF 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_off0000c0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DD 10516 bytes
SHA-256: 2e653835c5e1a464ebc70686d01a94bb253d0a910e54923bf859bb18f07689c0
font_01_sfnt_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 16980 bytes
SHA-256: c03bdfd2e4c32542f69fc658e9048f625f5248a7facdb25b27d68335196f0122
font_02_sfnt_off0001043a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1