Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb04e0675a18638a…

MALICIOUS

PDF

85.1 KB Created: 2021-09-23 02:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 392d46afbf0bc7b983a8c853ef0ba4f3 SHA-1: a25994414eb8fed39e19adee2cc26fdbd407428a SHA-256: bb04e0675a18638a0f840f6eaf70b0122425507eaeb4ecbaeb47a75c425b7dd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly imply it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://americansemitruckparts.com/d/files/7181210822.pdf In PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde51a5ee7---pagudozazedabixufev.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/jabogubor.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/bavejan.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/52232219331.pdfIn PDF document text
    • http://klenderbio.com/upload/files/98262940331.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613580d950967---ratotinakimizutevidukojaz.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19846191275.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/96532510867.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/3493014348.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/91011008742.pdfIn PDF document text
    • http://njxinbell.com/upload/files/54429862358.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630493304.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/61766129250.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/84514962878.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/radukofifiba.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/95386109779.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/gosumow.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/bidigunem.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/89938479985.pdfIn PDF document text
    • https://slide-bearing.com/d/files/7146519471.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/94579164618.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/65473243249.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/naronuburepewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hungry+shark+evolution+mod+apk+android+1PDF 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_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 18112 bytes
SHA-256: 97498d146da358196c2e3eeb1b71118b749082eb020ffb34fd102d5237fd92e5
font_01_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 11256 bytes
SHA-256: b1b8ab236075af80379374e18761d73a7142bce12454694eb6dae6b35c2376ad
font_02_sfnt_off00012de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1