Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db94415b7f848bd…

MALICIOUS

PDF

67.4 KB Created: 2020-12-19 18:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5997987365e3519ab2c7ef11c34a5c38 SHA-1: 9462917d19265bd55ef4c656ff3982c56d7cbfd3 SHA-256: 3db94415b7f848bd2a95069edc7bd66dd98fee4da2af234e6debe3acde59a13e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are to benign-looking documents, but one primary URL, traffset.ru, is suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the embedded links.

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/aws?utm_term=westlife+fool+again+lyrics+pdf PDF link annotation
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/4234620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461219/normal_5fd7ebb734cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424646/normal_5fc2777daee5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_5fa9e26c78005.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/weligatoreso_gopilanimogan_jitibi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5fc8da96059da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_5fa741dc49204.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcff31b474932ca267fa99/1606221623963/chapter_two_cells_tissues_and_integument_overview_of_cell_and_cell_membrane_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/kofiwunuwuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/niromarevonisegibe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc570e5104edf1d779faec4/t/5fd1a9e7871f8c6e595998a1/1607576041082/infinity_ops_online_fps_hack.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5deeb1c8c74131453fc73/t/5fd12db22a4f52003c20f6a3/1607544244038/wood_carving_classes_new_jersey.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28364c89e1c4b8fc8bd46/t/5fc506b8a97599144e979078/1606747834471/cantique_de_jean_racine_translation.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc287be084698658e68a4f0/t/5fcd56a95177ea328cd2da64/1607292586110/75352809279.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_off0000b6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E7 5440 bytes
SHA-256: cde3d4a5d42c785006bc70ad9919848a1ba44351d21d2b9dbdbb4557887c368e
font_01_sfnt_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 9788 bytes
SHA-256: fcde54b0603d4fa73b74d5e0a6983b897c9ba86edc0ee084da62a02b33eaa1a7
font_02_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 16176 bytes
SHA-256: a37eb9a23ec3aabe16fc7825e1da149af10d043718216101a51befffd1a95b48

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