Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cb8ec255c48d24…

MALICIOUS

PDF

72.2 KB Created: 2020-11-07 05:09:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0e96019b2d08a97b8a0a328fe4fddafb SHA-1: d85245ad7a3b93e70b9674c36b83e46c94e8b7b9 SHA-256: 36cb8ec255c48d24ca5b9739fcb3145e251a9de32a066514b028f35450bcdb62
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafficel.ru/aws?keyword=adobe+zii+cc+2019 PDF link annotation
    • https://sixonawujow.weebly.com/uploads/1/3/4/3/134369174/gubifegamomunosifev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5f95e4b437e5a.pdfIn PDF document text
    • https://ruwitopiramowu.weebly.com/uploads/1/3/4/3/134364975/92504d93a1c0f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_5f98b1291c388.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/d685060c-1053-4ffb-a935-e9c96168de94/74080612434.pdfIn PDF document text
    • https://napedez.files.wordpress.com/2020/11/jazafomaxuxodada.pdfIn PDF document text
    • https://visidisirel.files.wordpress.com/2020/11/59252272269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50c1c4f-ef79-48e6-8af3-8128ebdb57c5/sibugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023dfc46-787a-49bb-9e37-c16f400bf339/95010018997.pdfIn PDF document text
    • https://kajebevomota.files.wordpress.com/2020/11/56235423602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5f132c-e9ee-4238-ba17-d74d6b3d8cf5/39817150845.pdfIn PDF document text
    • https://sozolid.files.wordpress.com/2020/11/xufuluvan.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_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 5080 bytes
SHA-256: eee4414b49751858e499df8c02c5ad2d4a5d3956d1473b1339a1ff95eb9274f9
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 10960 bytes
SHA-256: 82caab72948aed24891b3777937b5622e197f072034c35e384db64a08bff5a08

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