Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f389e3007ea019e…

MALICIOUS

PDF

83.9 KB Created: 2021-02-20 02:55:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e8c3268fe9acbc6009e94832be0b5670 SHA-1: fee5c75c77915925377c0ffd3da0f4d4ac0ba022 SHA-256: 5f389e3007ea019e47896d2b58c9c6edf20e4f9c46083066a54a7fb89f9dcbfe
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute malicious content. The heuristic firings confirm the presence of malicious redirector links and a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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/wix?keyword=mecp+study+guide+free In PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/ligikomalikese.pdfIn PDF document text
    • https://molobaguzali.weebly.com/uploads/1/3/0/7/130739923/5a450c8b1432bf9.pdfIn PDF document text
    • https://fiwibafufo.weebly.com/uploads/1/3/0/7/130774969/1c3f8a993dd3cb.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/GdGhfji/4989945574.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/wedifuw_fomiteniwiriru_tikerobepepipow.pdfIn PDF document text
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/kanobuk.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/O5nibgd/hitman_reborn_wallpaper_chibi.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/M4ibjal/survival_camp_near_me.pdfIn PDF document text
    • http://gewebufokorilu.iblogger.org/coefficient_of_heat_transfer_definition.pdfIn PDF document text
    • http://wowezixuxaxu.22web.org/busqueda_de_informacion_definicion.pdfIn PDF document text
    • https://nipufosuvomabuz.weebly.com/uploads/1/3/3/9/133999137/mavubudaduxeni.pdfIn PDF document text
    • https://vugiwaxe.weebly.com/uploads/1/3/4/7/134739196/xuvamol_vukirizobugipid_vufetitox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pemebisifikase.rf.gd/learning_spanish_numbers_worksheets.pdfIn PDF document text
    • http://xazitew.epizy.com/66029235305.pdfIn PDF document text
    • http://kebanibaru.epizy.com/68600770725.pdfIn PDF document text
    • http://dopuviboxew.rf.gd/xifakojalanesojurofadul.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/visual_studio_platform_toolset_v141.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_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 5188 bytes
SHA-256: 717431d426af421209fa4f51a0a09ee3f939c1f07757c33d2125a8c4a0ff7a59
font_01_sfnt_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 13464 bytes
SHA-256: ccb6981a332c0c0577f83c5d376c6f8da34d9c98f3553fc604ed4e525b3e8ed0

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