Malicious PDF — malware analysis report

Static analysis result for SHA-256 109b7f2c8fef2dab…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 06:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e96d358cbd58f1d44c30394ff315bbda SHA-1: a796e726cb48e19aa1aa8879860d3f396b9061a2 SHA-256: 109b7f2c8fef2dab6283404ff182101625a672026ac15a3a387eb12e966aecb5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://rld-carbon.ru/file/pusijifunukub.pdf In PDF document text
    • https://hotelexpert.ro/uploads/files/gobimukefotikupedawapij.pdfIn PDF document text
    • http://wamer.org/userfiles/file/kovizomowisesodisokukar.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/sunivavabesibeb.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/livofinetijivusoxigot.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61911071291.pdfIn PDF document text
    • http://word.mn/uploads/assets/zelipikipudumavozajimutaf.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/13311223855.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/dukofeguxepovozowibakob.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/29744319222.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161357e83ac328---88590757092.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/buribetalenubeturus.pdfIn PDF document text
    • http://archbot.pl/files/file/tevuvatubow.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/85005366531.pdfIn PDF document text
    • http://pasaru.com/upload/files/disog.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/80119262553.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/50925388620.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/21565361822.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/wolofatodepabetidilagumu.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/16968136976.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/vuwinamubodumoveruwobaw.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210910021117.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/24291052810.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/72324504992.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b1eeecfd---97570061303.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/22582040784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=candy+crush+jelly+saga+wikiPDF 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_off0000da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 10984 bytes
SHA-256: be54dd78e832cd220d7b37a6796d8b08423577aafc0aa9520d993d6b5ce73f32
font_01_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 17384 bytes
SHA-256: 9372ce4aaecd1833473c4a2d83add6e7d585296b6744bd51db1483ef6d42dbf2
font_02_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1