Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54c02036d7ac86f…

MALICIOUS

PDF

74.7 KB Created: 2021-01-02 08:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f6f5edfd74506560d75566326dc3da05 SHA-1: e6c4012187c5a9bb8f49b2ac00cf9b44da2856d7 SHA-256: b54c02036d7ac86f0b77ecda2e182e31acbad453409baa74a4c98e8b6f52fdb7
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be junk data, but the presence of numerous external links points to a link-farming or redirection attack.

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
  • 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.
  • 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://gettraff.ru/123?utm_term=letter+of+good+moral+character+dui In PDF document text
    • https://fudegedetet.weebly.com/uploads/1/3/4/7/134733785/6212513.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/ggibuaZ/jurassic_world_the_game_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5fad5fb481a5b.pdfIn PDF document text
    • https://mivopolidenez.weebly.com/uploads/1/3/4/3/134349928/b0e1bc036af2.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/jjazDjd/endless_war_origins_mod_apk_1._1._20.pdfIn PDF document text
    • https://cdn.sqhk.co/kupulifip/jj8Ooid/subjunctive_indicative_infinitive_spanish_practice.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/f99a45b8-db0b-45ba-baf2-731f82f8bd01/42168591717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ad694d-8e7a-43fc-abd8-00fb555edce6/laughing_your_way_to_passing_the_pediatric_boards_2018_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe54eab-9a44-463f-9d5d-01049d17de5f/laura_redden_searing_biography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51de03c0-4ed4-4c88-a69d-55f04551b240/palukamow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce1f5a0-7b8e-458f-a76d-f74540ba4617/grande_ford_parts_san_antonio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08b0af9-65a8-4e74-b59e-b1790d7c4743/70479429710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8ba1df-e16f-4481-a39d-7a63b43b1f46/childrens_princess_dressing_up_outfits.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_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 5196 bytes
SHA-256: be7ddf62d6572bf70005a78ed20a8fcc27debd9587ba7b93795c03a3725a13a1
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 10176 bytes
SHA-256: fdf1c40891a496abd2562148a91ac667b2cf8679540ecdf92a40626629ad4c44

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