Malicious PDF — malware analysis report

Static analysis result for SHA-256 d441b9f33bad0ea9…

MALICIOUS

PDF

73.4 KB Created: 2021-02-13 10:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c1f442e8982d7a0eb1901c4200735638 SHA-1: 6e074b58751fe1efc4a55e7ddd680182b11001c2 SHA-256: d441b9f33bad0ea99ef08871d718921c1096a5fac59d12cf76f15bece216e910
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and numerous links suggest it is part of a phishing or malware distribution scheme, likely attempting to lure users to download unwanted software or visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wb?keyword=aptoide%20lite%20app In PDF document text
    • https://vipofobusaxipol.weebly.com/uploads/1/3/4/2/134234766/4a8f16e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446280/normal_600a1ed518ad5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373797/normal_5fe05427510e8.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/ilKrTWC/bike_rider_3d_model_free_download.pdfIn PDF document text
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/9312661.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/hfpfhdP/monster_shooter_game_download_for_pc_windows_7.pdfIn PDF document text
    • https://pipamoximiketo.weebly.com/uploads/1/3/0/9/130969724/d7fe0.pdfIn PDF document text
    • https://vubupegizisave.weebly.com/uploads/1/3/5/3/135315261/dajuten.pdfIn PDF document text
    • https://cdn.sqhk.co/furikute/gheUmpS/4315263734.pdfIn PDF document text
    • https://valexipeval.weebly.com/uploads/1/3/0/7/130775413/sigubizomofediwabik.pdfIn PDF document text
    • https://cdn.sqhk.co/dedizozife/jagghc0/guvinetevigo.pdfIn PDF document text
    • https://cdn.sqhk.co/kikutajaz/cihibfM/27676992117.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/gE9picZ/81357089596.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/romusupaxokojozediki.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/agfDLgj/tatazonatekedevekubidex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_6008964664113.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/duxerixaguruledijaju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexamif.epizy.com/luxuminojebad.pdfIn PDF document text
    • http://tinuzutajalik.epizy.com/allianz_travel_insurance_claim_form_canada.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_off0000e5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 4668 bytes
SHA-256: 242841ab6e9410233bd947cc838310423109490e0b99d7fa4dacd242639b8836
font_01_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 10212 bytes
SHA-256: 26860ebb8dda659886f607741df1b3988919031094394b3eb0527349c32f13e2

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