Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61551172ebaa230…

MALICIOUS

PDF

83.6 KB Created: 2021-04-06 21:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 25ecde75d171f479cfb13432fc92977b SHA-1: 6b1d1cfb95b0679d02eee55444ae0da1758175b8 SHA-256: b61551172ebaa2308e8edf0d232d71dfa61856439a7f624b1bcdb2277ca2dd7d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and Weebly hosting, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF structure suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/award?keyword=qasidah+burdah+pdf+download PDF link annotation
    • https://gorimulokubev.weebly.com/uploads/1/3/1/4/131438265/841284.pdfIn PDF document text
    • http://italywow.space/woodworking_projects_that_sell_good81wpv.pdfIn PDF document text
    • http://closemaze.com/xexegipigoduvomodys9xn.pdfIn PDF document text
    • http://jsexj.fun/wenasalagipazomuloxipav7zn38.pdfIn PDF document text
    • http://bellissimo.online/biwogibalexijii5z7u.pdfIn PDF document text
    • http://mnclassis.org/lesigolutujovibenuxnltjl.pdfIn PDF document text
    • http://alcozerox.com/zatamukimepina7a1.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/soxalusenipiz.pdfIn PDF document text
    • http://jedobafupaxuxu.iblogger.org/dwarf_fortress_wiki_temple.pdfIn PDF document text
    • http://naxovonukile.iblogger.org/site_para_baixar_jogos_android_hackeados.pdfIn PDF document text
    • http://buyfastedcircle.xyz/2974404337ozle0.pdfIn PDF document text
    • http://uaportal.site/monkey_ninja_warrior071gz.pdfIn PDF document text
    • http://omoikiri.info/zupupanawasosoot2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/51435da8-1677-48d2-8b08-ceaa4a656f67/sketching_the_basics_2nd_printing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b35710-6f60-4d36-b9fb-29c78f51685e/serenity_prayer_full_version_framed.pdfIn PDF document text
    • http://gewapapis.epizy.com/amortized_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b8cd4e-28ba-46dd-a5dd-4cf15d14bb65/dazesusebowuwasoxomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93495691-e842-4dcd-9b4f-f59587993b00/macbeth_modern_english_act_4_scene_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0fe9024-a45c-4ceb-b44f-2f886be7c212/87688442673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a02f6b25-c26d-4e71-a75c-f6732a8cbbbf/ubiquiti_nanostation_m2_loco_m2_wlan-access_point.pdfIn PDF document text
    • http://fobapisarut.epizy.com/wordly_wise_book_5_lesson_17.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000120f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x120F6 19928 bytes
SHA-256: cc3216a84f9e938692647b5af14589b5160c7158c0a85aa6e7afea3f8c909232
font_00_sfnt_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 5424 bytes
SHA-256: 6c30e399bf5cd72fca0766ca961109475b66311e6602e8bf6a32bbeaf3f8f544
font_01_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 12836 bytes
SHA-256: 58fa205a0384435bd2bd383d8f5895153263edd3acbfd1ee94aaa23090a7ae6b