Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94d7102f9d025ea…

MALICIOUS

PDF

121.0 KB Created: 2020-11-25 08:53:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a9a1ece41ea2ea6edb4956c456509830 SHA-1: d5e41899f0ce762afa21068ec347589c509bde1d SHA-256: b94d7102f9d025eac4afed6cc1a81627bac1fcb96342034274168e83b225b0bb
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one pointing to a potentially malicious domain (trafftec.ru), suggests a link farm or distribution mechanism. While no scripts were explicitly extracted, the PDF structure and the heuristic firings point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://trafftec.ru/aws?utm_term=2015+chevy+spark+lt+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378382/normal_5f8a1e0703646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5f9ff537490aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_5fa7027045acc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_5fb29dbf9615c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388827/normal_5f8f0048d45ff.pdfIn PDF document text
    • https://xozukogazi.weebly.com/uploads/1/3/4/3/134371147/1296630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413007/normal_5f96e113adc53.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/tumewigewuja-wemesulakajo-midileduxota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f875921adf3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5fa78a014e58b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/votawawo/shel_silverstein_where_the_sidewalk_ends_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/montana_guided_elk_hunts.pdfIn PDF document text
    • https://s3.amazonaws.com/lanowilovuviwib/spanish_frequency_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/25741137481.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/buckley_school_los_angeles_uniform.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000154f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F1 5756 bytes
SHA-256: a6bdc010d03e2a7e59fe00409ac35db05bfb245a30fd7f7f0713a3feda4d50bc
font_01_sfnt_off00016871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16871 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off000173d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173D4 11704 bytes
SHA-256: 9e7f0b5c2595faeea04049665e5b735c59ece53136ea8b0ffe53f37df1b9605e
font_03_sfnt_off00019c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C00 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c
font_04_sfnt_off0001b0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0D1 12296 bytes
SHA-256: 29b23a8c025052ea96c871286c150a1b627bc6e75a4b5c995685820179bde8af

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