Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc3a2ff59cb7348…

MALICIOUS

PDF

40.9 KB Created: 2020-11-06 06:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 25a45ef29838c2df861b33dd53200776 SHA-1: e1b3af1a8010e3ed028b1ffa1d5fa3f69e7dd73c SHA-256: 5fc3a2ff59cb734857b234ab7af149b6f69bbdd116ddbc0e7eb2fab6395cfae6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by an ML classifier and contains a large number of external links, many pointing to disposable hosting services. The primary purpose appears to be acting as a link farm, potentially for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the presence of numerous external URLs suggests a mechanism for redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffnew.ru/123?keyword=sukrol+vigor+mujer PDF link annotation
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/511a88f2e587.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/3257372.pdfIn PDF document text
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/ee426d863a.pdfIn PDF document text
    • https://dowezepuxaku.weebly.com/uploads/1/3/4/4/134463959/c3dcf4e998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449397/normal_5fa2d79d5f82d.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/vejixinilezo.pdfIn PDF document text
    • https://javumegibevi.weebly.com/uploads/1/3/4/6/134634398/e8be38d78.pdfIn PDF document text
    • https://gimelukisisira.weebly.com/uploads/1/3/4/0/134040832/1301124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5f8d62792f261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5f9054cd02846.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/3641505.pdfIn PDF document text
    • https://kisotupojez.weebly.com/uploads/1/3/4/4/134493444/wefufagu.pdfIn PDF document text
    • https://wojowoseda.weebly.com/uploads/1/3/4/2/134266381/fufiwobizin-pamoxopo-kimaguxek-wutibero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetazino/8429036780.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_off00006025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6025 4920 bytes
SHA-256: 2560e24df56fc89333c2039548c825014812b2e26ad727d0f8e0673293c1f368
font_01_sfnt_off000070da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 11544 bytes
SHA-256: 3086da68f3be7c38aa96932dbae7086d50e9f5a4553943de9775a2de35ffb65e

Open this report in the interactive analyzer, or submit your own file for analysis.