Malicious PDF — malware analysis report

Static analysis result for SHA-256 da128c4a8557a5ec…

MALICIOUS

PDF

83.4 KB Created: 2021-03-10 01:37:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b43768cca25f196cf7d6564f946fb9b SHA-1: 940e7c647badee679f84f25ae2987abf7b6b2906 SHA-256: da128c4a8557a5ec16003e5dd594b564d68c7c562f6c1cb4e4d03d96f69b6274
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/wix?keyword=clash+royale+hile+apk+android+oyun+club PDF link annotation
    • http://fastcreditcheck.info/2001_polaris_sportsman_400_parts_listl1npw.pdfIn PDF document text
    • http://remontlegko.info/ancient_egypt_numbers_worksheetsz21hi.pdfIn PDF document text
    • http://leqqurint.online/55841130216jhpac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_600d88a1acc3f.pdfIn PDF document text
    • http://vezagoxutejoza.66ghz.com/european_commission_ageing_report.pdfIn PDF document text
    • http://triple-doska1.club/apc_back-ups_network_40yjmjn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_5fe29dc259820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484807/normal_6038258000bcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_60198ade997f7.pdfIn PDF document text
    • http://shoop-fh.ru/14741954306qqexz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496812/normal_600076f94927e.pdfIn PDF document text
    • http://gemosugobez.22web.org/60503176692.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5feb5436527a9.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/jajixelebiseferen.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/tolizodawenagibatigaka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/remuv/ible_and_able_words_ks2_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/why_is_my_outdoor_antenna_not_picking_up_channels.pdfIn PDF document text
    • http://dudajulasur.epizy.com/82881577738.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/bajrangbali_hd_pictures.pdfIn PDF document text
    • http://rolodumom.epizy.com/56404083192.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/31855312213.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/nagudiji.pdfIn PDF document text
    • http://javewexo.epizy.com/movies_free_website_list.pdfIn PDF document text
    • 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 5372 bytes
SHA-256: 69cd151e5308d94ec914622726fe46c32cc1958c7d089bcd32a7197ebbbe5d15
font_02_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 9848 bytes
SHA-256: df3e7307c897ffe6b5eb500171f35e10927b13dc82c51aa887f63ecd053d6164
font_03_sfnt_off000129a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 16284 bytes
SHA-256: d35ddc6d2707e2460bd6bc3b87c3caeef0a7049dcfffb5ec8cb8324c60fb067f