Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2c41b8531ff06a…

MALICIOUS

PDF

107.1 KB Created: 2021-02-15 10:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: afbc21ad7e3933b3836755beb075d09b SHA-1: d88dbea420c97b6f2dd854012cee2ef137a8290a SHA-256: ca2c41b8531ff06a78b19b9228a5181ae2b8d11524f21410b676150bdfb2bad7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=is+counting+cards+in+blackjack+illegal PDF link annotation
    • http://duplicwcnj.space/city_car_driver_2020_download_apkogqic.pdfIn PDF document text
    • http://interbank.link/81635354721cgwac.pdfIn PDF document text
    • http://shopsupergood.site/chori_chori_1956_film_songs78tia.pdfIn PDF document text
    • http://rent-nout.site/cooper_discoverer_srx_consumer_reportsbq2hc.pdfIn PDF document text
    • http://wimosam.22web.org/38965277006.pdfIn PDF document text
    • http://monongzhlh.space/bdo_leveling_guide_56zwes7.pdfIn PDF document text
    • http://yewes.fun/coordination_chemistry_problems_andapbak.pdfIn PDF document text
    • http://setlyb.online/nesorewekezegobinuzoqif54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454807/normal_5fffce34c7da6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390382/normal_5ffc3208b1750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_600d12743b819.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dubabin.rf.gd/grid_connected_inverter_design_guide.pdfIn PDF document text
    • http://tosodesuvivat.epizy.com/british_comedy_guide_podcasts.pdfIn PDF document text
    • http://dojanipono.rf.gd/wound_management_guidelines_scotland.pdfIn PDF document text
    • http://dawiwafawuz.epizy.com/ifm_australian_infrastructure_fund_annual_report.pdfIn PDF document text
    • http://mesovinofezesat.epizy.com/vsco_app_apk_free.pdfIn PDF document text
    • http://zoletiwosi.rf.gd/56854402249.pdfIn PDF document text
    • http://mepusafufeja.rf.gd/kotak_securities_online_trading_guide.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B0D 2960 bytes
SHA-256: 4253ce374f546ed82c0b962bfad5e193173c5af7311640f7068ccdda2cb38311
font_01_sfnt_off0001658e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1658E 5324 bytes
SHA-256: bd772bfc7848d801c9528207ef200a5b5d688b0dd7264c3ca42f607274733d0f
font_02_sfnt_off000177b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177B5 11380 bytes
SHA-256: d9fc78ad5078ab2ae50894471cb9c557f1cb4e13e959e80ad1aab8dcafcf03ca

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