Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53550e45fbb2d3a…

MALICIOUS

PDF

35.5 KB Created: 2020-11-06 22:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 01e7ad3fe35a63f1ba78c7e58c1a180d SHA-1: b88080c966fdbe98b299cbf72bbd97fd979c4102 SHA-256: b53550e45fbb2d3a2dc84ca9bcc5c66f8f046f0c5bddb5dc5000c9ce7248a4f4
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://traffset.ru/aws?keyword=kohler+149cc+engine+manual PDF link annotation
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/xurewi.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/7873439.pdfIn PDF document text
    • https://kigivalivago.weebly.com/uploads/1/3/4/3/134337689/89deb967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f8732ca51ba6.pdfIn PDF document text
    • https://zatazonikafude.weebly.com/uploads/1/3/4/3/134340422/dobazexolurekop.pdfIn PDF document text
    • https://kotugelofamoxu.weebly.com/uploads/1/3/4/4/134403640/xodiluguku.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/9220672.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/henghuili-files/35973649405.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/wowifefexevokumisajabuxev.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/15924996322.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/xiturekirutakafok.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/polibu.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/43894079258.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_off00004be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BE1 5300 bytes
SHA-256: 2a91ff8e35e1a7292f846b55c2655d9cae92aecc468f221caffcffb051712fe4
font_01_sfnt_off00005dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCD 10528 bytes
SHA-256: a85b1145b234701d8d649aacf328757a073c5064c3637d5beb5712dc0890dfa8

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