Malicious PDF — malware analysis report

Static analysis result for SHA-256 641dac81e7a91891…

MALICIOUS

PDF

77.8 KB Created: 2021-03-17 06:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 957cf9df17e7666c562536e410e51f39 SHA-1: ee96a2a5a45fdaea9076e6af96e5cc3324af8978 SHA-256: 641dac81e7a9189133a72300d1a18d37e82c610343ca733adf82ca8c0cfd3220
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains or redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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
  • 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://pelibifir.ru/strik?utm_term=business+communication+class+activities PDF link annotation
    • https://cdn.sqhk.co/kapokosop/iigiiJ1/pokemon_tv_app_download_for_windows.pdfIn PDF document text
    • http://littlenat.space/toram_online_luck_mage_leveling_guideihw6q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476418/normal_5fc8182f59d85.pdfIn PDF document text
    • http://instas.site/mojejundss7c.pdfIn PDF document text
    • http://mifvideo.space/basic_calculus_derivative_rules_tabled28i3.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/id1gfjg/emotion_bingo_free_printable.pdfIn PDF document text
    • http://steblin.pro/letra_de_la_cancion_stressed_out_en_espaol_e_inglesiidvy.pdfIn PDF document text
    • http://morosoxumexax.iblogger.org/33460425608.pdfIn PDF document text
    • http://alcozerox.com/xevigonutezigabejopezoga2z31j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388060/normal_604e7e526764a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_6df9492e7d6d40858e35e0118988df40.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_6c82157fbfc848da8bf424a9e0715381.pdf?index=trueIn PDF document text
    • http://gipatoxusopupos.epizy.com/attributive_clause_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/18582646186.pdfIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_9ecc0334b79245e2b7d1b9d6aa5facf7.pdf?index=trueIn PDF document text
    • http://bugelinuxobeva.epizy.com/26060877033.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/906933955.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_2ff4db1c4bb8409aa139c548a8d0c60f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 4840 bytes
SHA-256: 2f70960045bf54d53f52747e3f8f96c5da81a8ccd61f7b6a3015e4b3551efbbe
font_01_sfnt_off0000f8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 10216 bytes
SHA-256: 625d88915f73229e1f08693e56814c1b589ef150abda79261b4633368971d30e
font_02_sfnt_off00011bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

Open this report in the interactive analyzer, or submit your own file for analysis.