Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb46c0193a61bb7…

MALICIOUS

PDF

48.5 KB Created: 2020-11-07 03:39:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 82db54866a3e843331557b58cc799edd SHA-1: a461304a9307fa26d173cd48641711bc009ea1fb SHA-256: 3cb46c0193a61bb727beabc85909dccad0cdd25bcba2d94cc2caffe00ca345bb
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=one+up+on+wall+street+pdf+download+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412164/normal_5f9c6dc52771a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408174/normal_5f9ae43f652a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408340/normal_5f9a0fd692458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_5f9f5b194a40e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413850/normal_5f9adc8240cf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5f8e91872a7ef.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/zetare/padel.pdfIn PDF document text
    • https://livatidepapo.files.wordpress.com/2020/11/29322475696.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/evergreen_lake_bloomington_illinois.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/rutizazarotuvonunuwutorok.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/tigutoguwabuxugotasaxovo.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/utility_theory.pdfIn PDF document text
    • https://remetipokuv.files.wordpress.com/2020/11/47008163834.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_off00007060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7060 4988 bytes
SHA-256: 92ab31a92f5e891918091440ff89a8c7fd614beb33bd066aab4c348e1c85e159
font_01_sfnt_off00008171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8171 10844 bytes
SHA-256: 183a6b44758f78b78471a03276c3d18cf3ede66366f953612f40290b799e1f15
font_02_sfnt_off0000a67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA67E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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