Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fa7b4aaf17b2c2…

MALICIOUS

PDF

102.2 KB Created: 2021-09-17 02:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ed2629f1b7ba2def93e1077847256ea SHA-1: a508e67cf002fb0c3e7def1698360bbaeea5abaf SHA-256: 00fa7b4aaf17b2c2f61cf4aeb4280bcb4798694d487b24eaf7b531200e2fdbf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many hosted on potentially disposable domains and utilizing UTM parameters, strongly suggests a phishing or scam campaign aimed at directing users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://lochoanggia.com/upload/files/50454737760.pdf In PDF document text
    • https://xedulichhaiphong.vn/images/news/files/20288610193.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210903205403.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/mopujovezago.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/zaguwuxokivujapejagasib.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/zuxabataxeroza.pdfIn PDF document text
    • https://hgb.se/filer/file/13242318949.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210903142719.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/fajugoruzek.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/23829020597.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/sulejezaxunabi.pdfIn PDF document text
    • http://jinyezi.cn/upload/sagegetalekajigapeje.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/balulipukuwumix.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/14235069802.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/47174303555.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/sujufetuvutofanikoxafosif.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/27158508747.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/rukepapuvitifiguzen.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff547ecb3c---pufagodetusatat.pdfIn PDF document text
    • http://gespk.com/userfiles/file/44595084891.pdfIn PDF document text
    • https://eclearusa.com/images/file/94836077313.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/6993000648.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ee64f1b0d99e8e9c17cf967e49cca1ae/8064007158.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/banevapibafapekobatanuwuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gta+san+andreas+mobile+download+apkPDF 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_off00012698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAF 10912 bytes
SHA-256: 6724ec5b1c60ae8756fb5086fb5676737b17b5add21c0e08b07acde08c5064ce
font_02_sfnt_off000157c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C5 19340 bytes
SHA-256: 6b54767531f31e96443a52daf667bad0b7294832d61167ed33cc7675d3f3c287