Malicious PDF — malware analysis report

Static analysis result for SHA-256 35eba75f8420ae55…

MALICIOUS

PDF

77.0 KB Created: 2020-12-08 07:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a0a1e392c4cc36e04b1efdc6d9a27c33 SHA-1: 2c3bf6e51d13a50b84f61a89c887022d4afceb0f SHA-256: 35eba75f8420ae5553fbdc0fb9dfd7b1e72bf094c7dd3b94768426fba8a8ccdd
126 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 embedded links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of a large number of external links, including one pointing to 'trafftec.ru' with a 'bellsouth white pages' query, suggests a potential phishing or SEO manipulation 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=bellsouth+white+pages+new+orleans PDF link annotation
    • https://nuwuzeparagagux.weebly.com/uploads/1/3/4/8/134883197/1190602.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/d7d6200a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456378/normal_5fc05950548eb.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/ed32395127.pdfIn PDF document text
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/c9dd94bf0ade4.pdfIn PDF document text
    • https://nosikofu.weebly.com/uploads/1/3/4/7/134724553/e797b03c3f.pdfIn PDF document text
    • https://deruwatago.weebly.com/uploads/1/3/4/0/134096830/5ab6e8380.pdfIn PDF document text
    • https://feresaxeto.weebly.com/uploads/1/3/4/6/134609658/sasatevuluseg.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/pireti-kakaxi-goreru.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/13eab.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/5fc6880a0a2757459b09dab9/t/5fc8883cb74dd54858db951c/1606977597255/srs_distribution_login.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/69309578596.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/personnel_information_form_dhs.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/blank_booklet_template_microsoft_word.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_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 5224 bytes
SHA-256: 844b1430b42ef0722ba109e552055672ca15cccdab2d7bcc9ead3f250ee1e413
font_01_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 11080 bytes
SHA-256: 244453072320ea68eed7a47ac89b8455b807fcb2686abc04409d49a2a3ab0c86

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