Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e7167accdd98b1…

MALICIOUS

PDF

79.9 KB Created: 2020-12-04 08:23:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe60ac91f7d05537ae164208ad24fbaf SHA-1: 78adca9de9c597334aa11cf581fbb09c36a21332 SHA-256: c7e7167accdd98b1c8029d9916b67ca6258369252e9bc55ef75a5e19b4fefe8b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or a method to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://trafffi.ru/123?utm_term=the+lost+heir+legacy+advantage+guide
    • https://kexoxuneve.weebly.com/uploads/1/3/4/5/134501441/80c3ae.pdf
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/mevugexol_jegelorolet_limaruwimujuwu_gonefimuzeted.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc66c8a8ef7301f8b36d770/t/5fc7cb7b2431962c2dc21d90/1606929277831/download_cat_warfare_2_mod_apk_revdl.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe18f8bc819f1cf4a0db92/1606293754167/xulaguniluxetemoron.pdf
    • https://s3.amazonaws.com/wukara/twisted_fate_guide_apdo.pdf
    • https://s3.amazonaws.com/sabobenuwe/clinical_pharmacology_made_incredibly_easy.pdf
    • https://static1.squarespace.com/static/5fc0e464ab79f442f229936f/t/5fc205829b1ed0353822d080/1606550918326/pejenaxisitawo.pdf
    • https://uploads.strikinglycdn.com/files/e46fd43e-7588-4777-a24a-f83c590cec1d/injustice_2_repack.pdf
    • https://s3.amazonaws.com/nuvukivaxiren/ample_guitar_m_lite_ii_free.pdf
    • https://uploads.strikinglycdn.com/files/d72bc248-a361-4a91-8af4-a6019b8aac2b/under_the_sea_journey_of_the_little_mermaid_magic_kingdom_2019.pdf
    • https://s3.amazonaws.com/lomogas/allegorical_interpretation_of_the_bible.pdf
    • https://s3.amazonaws.com/fenatagazise/sixth_grade_school_supplies_list_2018.pdf
    • https://s3.amazonaws.com/fapaga/tabuxuxa.pdf
    • https://static1.squarespace.com/static/5fc57c6e085bf90c0e1c1b48/t/5fc9b481fedaa13a48606658/1607054465763/zitotidetavekevavunis.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0e0d3c02f22b9dd4c6f3/1606290960408/70160422749.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc61.bin
8ac658c662615b1df01a1ba7c2e5caae46b57473f3937ce70b57c61c554b2824		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 5312 bytes
font_01_sfnt_off0000ee73.bin
baa4ba8134f771e6d9b7d5c6303e1be72c1e3c78ad8523db23a36d56f335e188		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 13716 bytes
font_02_sfnt_off00011d4d.bin
3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 16140 bytes

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