Malicious PDF — malware analysis report

Static analysis result for SHA-256 af98f91439f17442…

MALICIOUS

PDF

83.5 KB Created: 2021-04-15 19:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0abb750f8cf30191c458e154c9cdb416 SHA-1: 14a3d10c4a96ed0f0d1139795b99846d8b523905 SHA-256: af98f91439f17442de2e146d10d63c4eee03d456c34cc6c687bf116fa028c9f4
184 Risk Score

Malware Insights

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

The file is a PDF that contains multiple embedded URLs, many of which point to known malicious redirectors or disposable hosting. Heuristics indicate it's a malicious redirector and a link farm, suggesting its primary purpose is to lure users to external malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=food+safety+law+pdf In PDF document text
    • https://cdn.sqhk.co/tebefaravuz/dggPhiw/xovunijetufu.pdfIn PDF document text
    • http://dojisef.iblogger.org/pagisajojebiwizusu.pdfIn PDF document text
    • http://jomotew.iblogger.org/babukakisi.pdfIn PDF document text
    • https://ladeletoleworuw.weebly.com/uploads/1/3/4/7/134712388/ad548e9.pdfIn PDF document text
    • https://bufibetotireguk.weebly.com/uploads/1/3/0/7/130739935/ravezoxoro.pdfIn PDF document text
    • https://cdn.sqhk.co/sowumavag/c2KClie/55760007736.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/fAhgpgc/77467257740.pdfIn PDF document text
    • https://dukidisivaturan.weebly.com/uploads/1/3/5/3/135311912/8345407.pdfIn PDF document text
    • https://jubaluwaruzazux.weebly.com/uploads/1/3/2/7/132740890/5414727.pdfIn PDF document text
    • http://menegatuje.iblogger.org/sepsis_guideline_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zemigubu.epizy.com/cetoacidosis_diabetica_criterios.pdfIn PDF document text
    • http://tatasoge.epizy.com/weekly_calendar_planner.pdfIn PDF document text
    • http://wuwatomugexove.epizy.com/loose_leaf_paper.pdfIn PDF document text
    • http://fugazite.epizy.com/what_is_the_fourier_transform_of_xt_cos5t.pdfIn PDF document text
    • http://sikopenopod.epizy.com/how_to_take_back_off_of_graco_nautilus_car_seat.pdfIn PDF document text
    • http://xebupiwemumak.rf.gd/why_is_flash_player_blocked_on_chrome.pdfIn PDF document text
    • https://medlineplus.gov/foodsafety.htmlIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 4724 bytes
SHA-256: 921e289f00d6d95193afcc2c71adaed1ca55d4166962daa1870cee9f0cec4f93
font_01_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 6148 bytes
SHA-256: 149738eb3e1d0bfb4a5732e89a115965e6f0cf3fc4971c694d3ce3619176544d
font_02_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 11344 bytes
SHA-256: 2d7e63f9f158fbaea134a5e81211fc0d76f9186b5e008f976e896f752741b9c3
font_03_sfnt_off00013240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13240 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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