Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b79adc73f1e4c0…

MALICIOUS

PDF

61.6 KB Created: 2020-11-06 16:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a7829646e82d95df70f3b667ea8063b7 SHA-1: 4499b001fb08b72851cfbfd90c86779737a3690d SHA-256: f9b79adc73f1e4c00313aa946fdb2acb972527451f3d76f39ba23d14e0f561a1
136 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 external links, many pointing to an SEO redirector, suggesting a link farm or phishing campaign. The document body and embedded metadata explicitly mention "Wicked the book pdf" and a URL associated with SEO redirection, indicating a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or content-luring attack.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffset.ru/aws?keyword=wicked+the+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368222/normal_5f8e3ef832406.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/c8af7611-06ef-4053-9dee-071b15e97465/litaweluxadejiwowefetapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec02892a-49d4-47ac-b08d-d0daaae6c189/xekenigipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c7bb9a-ac02-467e-bd8c-8af082724587/wapuvulunizurevu.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/hernia_de_hiato_tratamento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6413ede9-29b8-4fab-83c4-0467ae733c51/22880404482.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/weworabaduden.pdfIn PDF document text
    • https://s3.amazonaws.com/vezosoluvezoj/tap_tap_apk_for_pc.pdfIn PDF document text
    • https://lugukanit.files.wordpress.com/2020/11/rizupuduvebiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af465d3-0a10-4e25-9a0e-059b6ca056fd/ziduzaru.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_off0000b0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A8 4944 bytes
SHA-256: f4e07987c6617ae1de648cf81ddb92ea34501f0a017be39c5c2d27ef7636c64e
font_01_sfnt_off0000c18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18D 12620 bytes
SHA-256: 3605bf3c4dd40e6cfd36f5cf20a7514268d7c77e18a0f7de0d19f1a9a7b52f74

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