Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e633393eb91a715…

MALICIOUS

PDF

79.1 KB Created: 2021-05-06 06:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9f7485475bdd9d89fcae8e3f6f644f99 SHA-1: 255ce22db77f5c49deda7e3ec253f3c65079f04e SHA-256: 2e633393eb91a7154caab3efe1441060aeb19d29c7b8cba47e11be7edcd2a96e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam. ClamAV and ML classifiers also flagged this PDF as malicious, with one detection indicating phishing and trojan activity. The presence of embedded URLs and the PDF's structure suggest it's designed to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/strik?utm_term=how+does+play+contribute+to+children%2527s+development PDF link annotation
    • https://cdn.sqhk.co/konidadelan/jhjaQhM/punch_boxing_3d_mod_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/yhgD8gv/beraw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_602cf556d04e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389387/normal_6015c451d827b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_600e086b62c7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472198/normal_6004823d8678f.pdfIn PDF document text
    • https://bigeriburaline.weebly.com/uploads/1/3/4/3/134334921/pedeposuru_goposagizor.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/jhMX6XX/vevunasekupifubi.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/papiv_mabizuku_xalaxoj_mexixijuzejik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_60600c39b2856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_602b258883056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_601bb39503141.pdfIn PDF document text
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/5938422.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://verirajoxa.epizy.com/.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/xivulipuvi.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/saurastra_samachar_bhavnagar_download_today.pdfIn PDF document text
    • http://mizumefazituko.rf.gd/a_court_of_thorns_and_roses_4_book_box_set.pdfIn PDF document text
    • http://nevegeb.rf.gd/ielts_writing_task_2_sample_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 5704 bytes
SHA-256: 3642fd2ba52978f592bbaf3782863b1ebc8552f6da719819620c3b3018328ff5
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 10520 bytes
SHA-256: 1b1ae900cb1d354e3a4b5556f164dbd644044510564c21ce52d89c9e6e669d7a

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