Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0b7c19c882be09…

MALICIOUS

PDF

92.8 KB Created: 2021-04-30 00:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 09d517d2b11cdeecf0affb723abf05b4 SHA-1: c0a82b4da8f612d3c6428d83874313df7da30579 SHA-256: 7a0b7c19c882be0925fc89829ab1a1ea0de6b094c9e1ad1734e8199e4474cbae
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://xezojetit.ru/strik?utm_term=mens+blue+dress+shoes+outfit PDF link annotation
    • http://bezigex.iblogger.org/pdf_to_word_converter_free_download_full_version_apk.pdfIn PDF document text
    • http://byseles.xyz/spanish_subjunctive_practice_worksheets_freeya0gd.pdfIn PDF document text
    • http://yewes.fun/how_do_i_enable_the_dhcp_on_my_routerve7jm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402014/normal_604dd38d24891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_6058250d92277.pdfIn PDF document text
    • http://ver-alex.website/50086443731s4s3y.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/soul_music_blogspot.pdfIn PDF document text
    • http://experiment.website/what_is_the_area_formula_for_all_shapesxr4kn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5fcf8c916fb0c.pdfIn PDF document text
    • http://fuxagiwowasiwu.22web.org/midezibisodufasif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_60522819bf502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_600a6501de519.pdfIn PDF document text
    • http://luzovimivulurip.22web.org/xobupegomal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_605e16a3afd11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5ff3aa591a658.pdfIn PDF document text
    • http://wirelessinfo.ru/how_to_block_acrylic_knitted_itemsmnrt9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5fc593acd0ec3.pdfIn PDF document text
    • https://lusimijibujadex.weebly.com/uploads/1/3/4/6/134677052/5698389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459630/normal_6050cb3063d4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464077/normal_605c0301dd73b.pdfIn PDF document text
    • https://vezinamitin.weebly.com/uploads/1/3/5/9/135984824/0cb12b9d8d8e291.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_c0f9f46f919f41a5bed5c4f5c8fcb065.pdf?index=trueIn PDF document text
    • https://535f918c-e50e-4760-9dbe-4b22a9cc1357.filesusr.com/ugd/65883d_30d8e5c913554892b9db83b595ddda8f.pdf?index=trueIn PDF document text
    • https://b81f28a7-a6cc-4df9-aebb-a76b708ee4b5.filesusr.com/ugd/df05b2_c508ebdf9d3443fba89b183106f4ef80.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_22551dbc10bc4c6293771ada6d2ff5bc.pdf?index=trueIn PDF document text
    • http://ximagutetala.epizy.com/calcaneus_deformity_correction.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
    • 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_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 4928 bytes
SHA-256: a9fc3b36f20cff603df70c58d348e33eb1d6544e35bd8722fc9e86cbf3c198a3
font_01_sfnt_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 11188 bytes
SHA-256: bdb5468daddc9c9fce676fb056c9f90837564789ba73663e3488d8887fc2fb06
font_02_sfnt_off00014e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9C 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67