Malicious PDF — malware analysis report

Static analysis result for SHA-256 0558c281674bd72a…

MALICIOUS

PDF

38.6 KB Created: 2020-10-07 15:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: da024eff88cbafa147d85e1e570b9019 SHA-1: 53d26fce657fd6a33d3746dd73b0271ae87d7cd1 SHA-256: 0558c281674bd72a7d86b37d210b1fe23c776677fa80f6304bb6bb233e8ba7c9
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?keyword=excuse+letter+for+being+absent+in+sc In PDF document text
    • https://site-1040354.mozfiles.com/files/1040354/23773147737.pdfIn PDF document text
    • http://jatorobo.futurespresent.com/uploads/1/3/1/3/131380213/zomevobomuka.pdfIn PDF document text
    • http://sawew.100suits.org/uploads/1/3/1/8/131858540/7274516.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4406/4408/files/gikudawazitijijuwawova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5517/7624/files/box_and_whisker_plot_worksheet_1_answer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0546/0125/files/frog_defense_mechanism.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8696/5672/files/67411065123.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9454/4036/files/59184147939.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5940/4191/files/ecuacion_de_la_recta_con_dos_puntos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8844/0213/files/90216820598.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7709/8902/files/30548825212.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4395/3567/files/xuvijilibeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9961/1047/files/tezugajig.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_off00005a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A75 5212 bytes
SHA-256: 6372da235198eb941cca646a98dfdd24fe4080f9ef667d5bacd94173129a47b4
font_01_sfnt_off00006c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C46 9736 bytes
SHA-256: be699269d1fc1d374d3bbd3045ec3668b63b73bbca04647adf3685827f171065