Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bb19b82812eb2e…

MALICIOUS

PDF

100.0 KB Created: 2020-12-21 05:15:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8406e01f1c73e22f487d22ad68310a55 SHA-1: d295aea794154bdb38bedae52fdd692124c72320 SHA-256: 77bb19b82812eb2e86c0d14a8892d717d0100b024506521d4b4f8bfd2eb7440b
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 pointing to benign-looking PDFs on S3 buckets, but one critical link to 'trafffe.ru' which is flagged as unknown. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan threat. The PDF_SEO_LINK_FARM heuristic suggests the document is designed to artificially inflate search engine rankings or distribute malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=caracteristicas+del+realismo+en+espa%25C3%25B1a PDF link annotation
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/nupekif_vavak_tiwele_veludogifoganos.pdfIn PDF document text
    • https://tuxotakej.weebly.com/uploads/1/3/4/5/134524070/9d057a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/wpf_treeview_hierarchicaldatatemplate_recursive.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/front_range_academy.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/plant_cell_parts_and_their_functions.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/nurizufiruwomedomoso.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/circular_saw_guide_rail_toolstation.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/24338338764.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/adobe_photoshop_lightroom_6.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/lijifom.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/vusijov.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/math_worksheets_grade_1_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/criminal_movie_tamil_dubbed.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBE 5240 bytes
SHA-256: 0f291f119e411f11c532cce0b7fa945310fb1e9d2480565b9726cf670ece0d1f
font_01_sfnt_off00014e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2E 11204 bytes
SHA-256: 0206cb8ee7d7320e2a1455275f27f45589f1851fd2404c722e5230038e976fdc
font_02_sfnt_off000172a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172A6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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