Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c59e819a82272f…

MALICIOUS

PDF

81.9 KB Created: 2020-12-26 09:56:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3330395f840c7e1ad9a946804af88ebb SHA-1: 0658e23affd77671eda97b7abaadc2957adddef4 SHA-256: f0c59e819a82272fb870fb9d69e0888e63d536226e54b9e42e8950b489977531
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector. The document body, though heavily obfuscated, appears to reference policy manuals, suggesting a lure for phishing or malware delivery. The presence of multiple embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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://cctraff.ru/123?utm_term=medicare+benefit+policy+manual+chapter+15+120 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5f893b3369afc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f8b2ea595824.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/6eifijr/starting_over_chris_stapleton_album.pdfIn PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/9118416.pdfIn PDF document text
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/8033176.pdfIn PDF document text
    • https://norigawe.weebly.com/uploads/1/3/3/9/133988483/9064611.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/085e8efba9fb565.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/levumoduf/90033531913.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/20438375269.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/focus_on_ielts_foundation_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/chunks_malayalam_movie_free_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c3f6da3-5b5b-44c2-9111-ced9e7c18b5a/dosajo.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/bebugoliketonotiga.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/92534740945.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/wilomuwam.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 5912 bytes
SHA-256: a43ed7de94074986e864495b6e168e653110da240b55166e1daa47e420a93f8b
font_01_sfnt_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 11728 bytes
SHA-256: 642846edd0258a6f9c0f557caf2afdd3242875cdc963d2a4ccf5e903117da3bc
font_02_sfnt_off000125de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DE 16068 bytes
SHA-256: 12bdfdd26b42687ed6d6e4673084773943fc64d80ea302008a05158b1f99f3df

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