Malicious PDF — malware analysis report

Static analysis result for SHA-256 1885dc73b7d8ea28…

MALICIOUS

PDF

44.2 KB Created: 2020-11-04 16:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: d684cd4c80f8f4cb6bdea8ea0a99ae25 SHA-1: 311951093fb7b0c5f4e22b55a1e64bb910c2c49e SHA-256: 1885dc73b7d8ea28e4cddc4a106519a9c0eba2388d226a44159f2db12fbaffe7
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://cctraff.ru/aws?keyword=incomm+support+phone+number In PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/1277742.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/juzapedewevomup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5f8acf808af5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f897a00c0263.pdfIn PDF document text
    • https://ritibamubube.weebly.com/uploads/1/3/1/4/131437410/04f6c.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/widipumov.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006441.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006441.bin)
    • https://s3.amazonaws.com/watajive/xujunigiwogobo.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/85167603523.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/johnson_repair_manual_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/tavemopujabomixusorisusi.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/vakifepenagoxurabogaxim.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/antiretroviral_drugs_list.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/arithmetic_progression_class_10_ncert_solutions_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/busageralefedorererabawub.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 extracted file (font_00_sfnt_off00006441.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6441 5008 bytes
SHA-256: c4825cdf4db45197cf473b423c706b555e009d87814eff24911b7d087d10ff32
font_01_sfnt_off0000751b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x751B 2196 bytes
SHA-256: e77110a68c37ceee00387f815cd73a9f8d571c346eee779dd58688b1356982db
font_02_sfnt_off00007f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F31 10660 bytes
SHA-256: 8100c50fa4c8442c79e42b87bf5b8e702b0cb0871628aafdb4555af07d541e63