Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e52d1a0b43c10c2…

MALICIOUS

PDF

77.3 KB Created: 2020-12-30 12:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a845be4adf74c443b1e3a2659f2f0e07 SHA-1: 77aab551533e18c296b1119315d0f1db7bb662c9 SHA-256: 4e52d1a0b43c10c273074cb2c1df9fd5082c204011d9d2afbf18c2d291b898f2
242 Risk Score

Malware Insights

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

This PDF file exhibits multiple critical heuristic firings indicating malicious intent, including links to known malicious redirector infrastructure and a PDF link farm. The ML classifier and ClamAV detection strongly suggest it is a phishing or downloader trojan. The presence of a visual download button lure further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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
  • 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://traffmen.ru/123?utm_term=nus+downloader+wii In PDF document text
    • https://dajepulexito.weebly.com/uploads/1/3/4/5/134591334/tudedamururol-tijibibegikabu.pdfIn PDF document text
    • https://luwufanemalowix.weebly.com/uploads/1/3/4/6/134643085/856688.pdfIn PDF document text
    • https://cdn.sqhk.co/wediximewoza/gcQghig/megan_is_missing_netflix_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/b0giJic/muwuzimofanoxexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc764ee5-205c-4479-841e-f92d52205419/fundamentals_of_physics_9th_edition_solutions_manual_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/ipod_shuffle_user_guide_4th_generation.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/mulosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32571def-920b-44ed-8199-69e19101abb7/22259984402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6dfc8f-bfec-406d-9ae4-bfc4a48d4fca/aristotle_vs_plato_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ee50fd-bbe9-47b5-b0bb-f2e169d95f40/93521669228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc19d65f-0d0f-4835-a737-f7bc8cde1440/suzivenafufawizavilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd6d1f3-dac8-40e9-ba49-949fb84573c7/35489384812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a296e9ef-d0a8-4051-b16a-79b352f4f9c5/hp_battery_driver_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/wewires.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_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 4880 bytes
SHA-256: 1f95f9cc851e772d36ba8ce769887358bd95942550087645dc10545bb24581ef
font_01_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 10948 bytes
SHA-256: d126d4533ba8c5e89a06a860c8f2b6aca4c8d797770ac048d92c4013b6a4d9bc

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