Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7afa30e8de41ca…

MALICIOUS

PDF

91.6 KB Created: 2021-03-27 10:34:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a550cbe25b1693e295435ae392a115a SHA-1: dedc24205da463eb5a96340c16a9dfc509268b45 SHA-256: 3f7afa30e8de41ca1430a9a21df1b428696753d80aada3c28a2d7414289f35ab
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many of which point to suspicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=bodas+de+sangre+resumen+por+actos+pdf
    • http://esagafow.fun/usa_college_football_live_scores6nl51.pdf
    • http://musc-media.xyz/5_interesting_facts_about_earthworms27tk0.pdf
    • https://cdn.sqhk.co/sagitusat/zuOjbhi/fix_it_to_break_it_lyrics_deutsch.pdf
    • http://tradestaroffice.com/4634621167926ll6.pdf
    • https://cdn.sqhk.co/rapawaferew/jjwYijd/wood_shapes_cut_and_painting.pdf
    • https://cdn.sqhk.co/kagawupatow/gez1r4p/jebuwo.pdf
    • http://my-favshopg.online/microbios_y_enfermedades_ruy_perez_tamayow1g89.pdf
    • https://cdn.sqhk.co/xufatirumina/9himbu4/snowball_money_high-_interest_accounts_receivable.pdf
    • http://tryplafond.xyz/10160779159vvzj8.pdf
    • http://ru-payment.casa/56927989936zmbbt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/putelekireza/abu_dhabi_indian_school_uniform.pdf
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_3417290e9a8d45fba4d10ff977eab77a.pdf?index=true
    • https://s3.amazonaws.com/firigugixujotov/38837737679.pdf
    • https://s3.amazonaws.com/xoxaneral/79054854349.pdf
    • https://s3.amazonaws.com/paropabaru/37060070287.pdf
    • https://s3.amazonaws.com/perurulexi/91029799446.pdf
    • https://s3.amazonaws.com/juwofuxufijup/87188823194.pdf
    • https://s3.amazonaws.com/lanaladu/jagakuvejubifikut.pdf
    • https://s3.amazonaws.com/faluzotixupi/89487539892.pdf
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_75d6677f2ad942f7b0c640a6cbfccb96.pdf?index=true
    • https://s3.amazonaws.com/wiwuxot/35805121703.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001257a.bin
762a2009e8a16d47b67dfd7432f6446e3669bdc1d96758a9dc4a71f0c5abf1ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 5492 bytes
font_01_sfnt_off00013815.bin
9ac74e0ca1f8ed7df4433e3bb6875a4149bd341bc753e9135ccbdc2fedcab802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 12288 bytes

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