Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67352448e40e2ae…

MALICIOUS

PDF

82.7 KB Created: 2020-12-18 08:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9151509916849c62722184954dc1ca7c SHA-1: d001c4d987159d7e8e8eb89e0dfd6678d73cd868 SHA-256: a67352448e40e2aeb7d7e3a4d8721f214593f159de9eb60c1e5b68f9567191df
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which are numeric slugs, suggesting a link farm for SEO manipulation or phishing. One of the primary external URIs points to a suspicious domain, trafffe.ru. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=jones+reagent+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5fd3541b2ff7b.pdfIn PDF document text
    • https://zafovuzixo.weebly.com/uploads/1/3/4/5/134588091/1933138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_5fad75a8e2d5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5f9b2c5367858.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/limexeduneniv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_5f9624533306d.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/bavasisati-jusewem.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/5fc0e8305687f52b6b812c21/t/5fc1cc93fa04221c7161d757/1606536339736/40571733353.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f16f7d0c8f249d4106bd/t/5fca8797071c6625ee785fe4/1607108506140/41932268372.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10561405d5340f32a3b3e/t/5fc9fe0b55485c3109b67d3e/1607073293800/popijarejezalisepokiju.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/tuxagulevu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d4752bbd7406580625ec/t/5fc38922173fb5383b10bc13/1606650148255/95157794238.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00570a3bf4b14aba44e61/t/5fc1c4b13485235c86086768/1606534321655/words_that_start_with_geo.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/excel_bedingte_formatierung_datum_gleich_heute.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 4812 bytes
SHA-256: 62ce439bab6ee76b18cde0accb3057b022f48b594a69bcdd796ff67e142d57f8
font_01_sfnt_off000118a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A4 11060 bytes
SHA-256: 3c7ae1d112e4445fda9d822dee983b77b9c7d00f8b9c2d16b4cfea40de1982f2

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