Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85fd3d81fefee58…

MALICIOUS

PDF

84.6 KB Created: 2021-02-22 17:52:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 18544f878cfafe51f8f71719680d3fb1 SHA-1: 7371a3e2a47791497267ceede0a674b60353f640 SHA-256: e85fd3d81fefee587c1325ea761b0c7503ab253dc641a46b42b8efeb466469d2
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs, one of which is associated with a link farm heuristic, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, while appearing to discuss a Rubik's cube, is likely a lure to disguise the malicious nature of the embedded links.

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://baarspo.ru/123?utm_term=how+to+solve+3+by+3+rubik%2527s+cube+last+layer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392649/normal_5fdf7d7b27372.pdfIn PDF document text
    • http://reabook.online/hide_files_mac_catalina2lq3t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_602b7539ba4f2.pdfIn PDF document text
    • http://frukt.space/syringomyelia_chiari_malformation_dogslxn0i.pdfIn PDF document text
    • http://tublitalia.fun/lefuvopapugokexojibus6w85.pdfIn PDF document text
    • http://teaitalis.space/tureja4pzdm.pdfIn PDF document text
    • http://fixmarker.fun/mojixenenwm6a.pdfIn PDF document text
    • http://garant-ritual.online/pewdiepie_legend_of_the_brofist_android_apkrj3s0.pdfIn PDF document text
    • http://trysalon.xyz/bhojpuri_video_dj_waladtvg7.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/bharat_movie_song_salman_khan_videowqlix.pdfIn PDF document text
    • http://vpntop.info/bassinet_sheets_adairs0mmn0.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/soccer_skills_training_near_mevu711.pdfIn PDF document text
    • http://bilabeseximilew.22web.org/69197471701.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
    • http://nedafab.rf.gd/pobedukaduzolewumeliro.pdfIn PDF document text
    • http://lojupodinitaxug.epizy.com/37550940553.pdfIn PDF document text
    • http://naxokagad.epizy.com/abduction_full_movie_free_online_no.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 5188 bytes
SHA-256: 4942b1c0ba5497f272511f65b1fb534340b8fb5b3425dcb2a7ce5f60ab263ae3
font_01_sfnt_off00011361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11361 10360 bytes
SHA-256: 81344c46f53048a695c2431f2f3732ffa02aa3dc57f3a09129bf08f9cdc62b7e
font_02_sfnt_off000136e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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