Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5775e1e85c2336…

MALICIOUS

PDF

41.1 KB Created: 2020-11-07 21:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 69f23332d75fd89796171aab955594f0 SHA-1: e6de03ef87c422cc3ca57462cd06121e45054a64 SHA-256: ca5775e1e85c23367a07eeca931da2b88a21ff116bebe16f9f4f663f467ace7a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the structure and heuristics point towards a malicious intent to lure users to external 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/aws?keyword=boxing+live+2+hack PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445866/normal_5fa51551f3392.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/ziwafema_gubifowuwupakoz_lobakibi.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/4c9abb978.pdfIn PDF document text
    • https://kowevufewes.weebly.com/uploads/1/3/4/3/134388306/4688124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5f8a0b9dc532d.pdfIn PDF document text
    • https://durewisopugus.weebly.com/uploads/1/3/4/3/134369166/vafusobe.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/wuloxogujot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/880a3ea0-f5c3-4e45-b732-c098a8852589/beyond_diet_isabel_de_los_rios.pdfIn PDF document text
    • https://palotev.files.wordpress.com/2020/11/moder.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/petuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faaf32ee-0747-4b95-93a7-0d29c5a4336e/dajigigikamof.pdfIn PDF document text
    • https://towuputuwome.files.wordpress.com/2020/11/robeledabikikulogowiparoz.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_off000061d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D1 5160 bytes
SHA-256: 78ab6c1fcc2c71369d3d91a7f81d6b8265b077a0b932d360cab1bb33ddde6f33
font_01_sfnt_off00007370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7370 10716 bytes
SHA-256: adfd132992b145ac409e88752b23671a66258c6e898f9d9893367e9a91e76466

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