Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05385028d6aa057…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 15:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 93bdc821e7a031cbd2d15e073588733a SHA-1: 2bef20fac156776f4d5b2c6998e43fc4f3c57dd9 SHA-256: a05385028d6aa0575a4632a0be18e4f0d411c8feffb6358db15ed6781f62b7f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to file hosting locations, suggesting a phishing or malware distribution attempt. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161441eb778fda---46819879307.pdf In PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/7282521178.pdfIn PDF document text
    • https://nistd.in/userfiles/file/11970061425.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/wowatekajesonisirekape.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/tomusox.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/30254784563.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/nawumama.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/zamarudagoluvukavone.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/41831325789.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320aec1f825---6288278917.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/dukanuvunesitowabigipe.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/sijozoxajikilimikalorefa.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/32559927288.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631042036.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/33285718863.pdfIn PDF document text
    • http://aedjtj.pretty-match.com/upload/files/narevelolijofigof.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/mikozedijilaziwu.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/zapofiki.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/wuwitesemowunef.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/94313287507.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/dejidagasomajukotorun.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/tumatomevimimukonuja.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/4249870239.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/wajexajobikekugibiwutix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gta+3+app+free+downloadPDF 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_off0000afd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD3 15840 bytes
SHA-256: 45d76f89ee38bfeeb9eeca05d87d0bf07668d4087717f6fdf5128646f5a1e20d
font_01_sfnt_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 10528 bytes
SHA-256: 02b853481d8a845df7956ce3827aef91254fcc3551a4bf301677dfeef65aec01