Malicious PDF — malware analysis report

Static analysis result for SHA-256 68057c4d156a2374…

MALICIOUS

PDF

86.0 KB Created: 2021-04-03 06:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab8e0283e4fb8654d892c0438c8fc25b SHA-1: 34ed2b92cf9773867cd088aee049feaccb7f0c90 SHA-256: 68057c4d156a23744ea10489f0003088dd637d58a3600a82244f59409083e697
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm and an external URI suggests the document is designed to redirect users to malicious content or facilitate further downloads. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/123?utm_term=chelsea+jersey+font+free
    • https://cdn.sqhk.co/ketusugedi/fNighcO/50369902562.pdf
    • https://cdn.sqhk.co/mesafovojifo/jhDgggd/99926528067.pdf
    • https://cdn.sqhk.co/vefoveted/biejejj/rorobiled.pdf
    • https://cdn.sqhk.co/futidiwe/il3gf4F/befanevetawenigewisakolib.pdf
    • http://lerawutevokaj.iblogger.org/31594926464.pdf
    • https://cdn.sqhk.co/reposivekow/3W40q6z/launch_federal_credit_union_titusville_florida.pdf
    • https://cdn.sqhk.co/monazaxumol/jaCrARD/zaxenobewuvak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_f05396b0cbf84a939332ef13482c6259.pdf?index=true
    • https://s3.amazonaws.com/nitatotol/zogizatusesodogav.pdf
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_07e3067d6bf84f09b356a9d10ecfbfc0.pdf?index=true
    • https://s3.amazonaws.com/lixisariwulo/jiligoxel.pdf
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_f1901954ab314026a3aa165d8d5c98e9.pdf?index=true
    • http://xanomake.epizy.com/is_etrade_better_than_td_ameritrade.pdf
    • https://s3.amazonaws.com/dubiditiginowo/how_to_say_change_sheets_in_spanish.pdf
    • http://gojesetikibal.epizy.com/bisection_method_c.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_48f977dadb2d478baf8b7eb0adb4b9cc.pdf?index=true
    • https://s3.amazonaws.com/wezukep/59025359922.pdf
    • https://9dc8676a-0e58-44ee-a512-e339c7094702.filesusr.com/ugd/7c0652_f03e11340a4c4e22b813b0c87a641759.pdf?index=true
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_b1337503930848f7a120ce6d65a2d2aa.pdf?index=true
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_cca3cf6e444b4aff93e1b01933c40878.pdf?index=true
    • http://pimibini.epizy.com/xusixebasumarofex.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_off00011391.bin
6574fc5f2844840b8b27c29f460bdd84c85469c9f64695d66957ea52d02f94a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11391 4936 bytes
font_01_sfnt_off0001245c.bin
7116912ca408afa1c8396a5cf3040da3adb69d67b3a06bd33733c6e05fbc3c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1245C 11524 bytes

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