Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e91720a02b6903…

MALICIOUS

PDF

71.2 KB Created: 2020-11-09 07:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 854f59226032349ae4b9e3997b4191cf SHA-1: a55609f9a2af0e2f4942731fcfad6e1aac6bfae9 SHA-256: b2e91720a02b69033ac2f96f2c28a18223f7067512f3d1f71771a7cac27493f7
136 Risk Score

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://trafficel.ru/aws?keyword=head+middle+magnet+teachers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389797/normal_5fa8b0a61f270.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/191e5a51ec06.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/vabezufewawoverik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_5f8bdecc444cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453575/normal_5fa5f18d8e5b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5f9397d7c94e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f87136c3b35e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_5fa2be0a462c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dumupa/lifenuvimaxiziji.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/68091325827.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/muzadidopuwitabikelirimi.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/pofosoweroz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 4992 bytes
SHA-256: 15ca9b1eaae2c4c5ffaee8500b5609c30e4d3d2e85d21273986477f3bbcaec9c
font_01_sfnt_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 11136 bytes
SHA-256: 8b18e90827bbda2b851cb924b6865fbcba731deb589cf0a36900c4d411d82299
font_02_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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