Malicious PDF — malware analysis report

Static analysis result for SHA-256 2313d4dd46c84aa6…

MALICIOUS

PDF

75.2 KB Created: 2020-12-15 16:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c9a3e28f3188e3a7897d047be37c9dc9 SHA-1: edbb3afba2276239eddcba020d5325cd300914ef SHA-256: 2313d4dd46c84aa65bd242f19a5540b134fec1ff3eccbc743c7ec8c8da83fa46
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'link farm' pointing to various PDF files, including one at 'https://fomemifeju.weebly.com/uploads/1/3/4/7/134769467/nopoxufo.pdf'. The document body, though partially corrupted, suggests a lure related to employee well-being. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely for phishing or redirecting users to malicious content.

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
  • 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.
  • 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://traffset.ru/123?utm_term=a+review+of+employee+well%2525e2%252580%252590being+and+innovativeness%253A+an+opportunity+for+a+mutual+benefit PDF link annotation
    • https://fomemifeju.weebly.com/uploads/1/3/4/7/134769467/nopoxufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fa462177ad68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f88db234181a.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/zaxawetawupo/directory_path_traversal_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/template_banner_cdr_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0f3718e72e5fdb9e6508/1606291255481/fatadodubafafowedilivi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5cea240f1034a5cca809d/t/5fcfce74d75d4c4c57434bbc/1607454327068/soviet_military_buttons.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/bawigoxapewapi.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/music_aaron_smith_dancin.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/administering_medication.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/template_infographic_timeline_vector.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/maboxedukitenof.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc708a58d6e8c3767c103d1/t/5fcad011bce7087d1acfc1ee/1607127059063/botasul.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_off0000d031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD031 5796 bytes
SHA-256: 3ed03dc04cb45c9a68c48c214430da2b79d1650d6ebfc2a055db0f1fb4bc225e
font_01_sfnt_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 10088 bytes
SHA-256: 9f43eb633c370edcaffeb4382f64321463d683d887547cd71b2c54b4c590f9a3
font_02_sfnt_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 16112 bytes
SHA-256: deb027fae6d061b90c7f19f9d49945553a6350ca93675d33d451a80a874d1d55

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