Malicious PDF — malware analysis report

Static analysis result for SHA-256 1922a5056accf6a8…

MALICIOUS

PDF

39.8 KB Created: 2020-10-02 07:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 736df1c1da3275c67e0f9a54fde0d966 SHA-1: ea7c7874b7e832485606b163acf03f7eea42e98d SHA-256: 1922a5056accf6a8bb25120f0b4a280d92a6e6d68c76c609358aacd98db177c5
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/strik?keyword=church+building+plans+pdf In PDF document text
    • http://files.discountfootballshirtframing.net/uploads/1/3/2/6/132695741/tununisopow_kibibu.pdfIn PDF document text
    • http://ketubi.brenthampson.com/uploads/1/3/0/7/130775200/8017012.pdfIn PDF document text
    • http://govamam.interdynartis.com/uploads/1/3/1/4/131437502/xepeduwipo.pdfIn PDF document text
    • http://files.nothingbutxmas.com/uploads/1/3/1/8/131857315/3709780.pdfIn PDF document text
    • http://files.creativconcepts.studio/uploads/1/3/1/6/131637257/b4972.pdfIn PDF document text
    • http://vodakuno.partnersdrivingstem.org/uploads/1/3/2/7/132740900/4343500.pdfIn PDF document text
    • http://files.livingstonslittlelearners.com/uploads/1/3/1/3/131398134/polevobomifopidif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bada5e10-f72c-48d4-8be9-3d0646dfa32b/mupebowuwezipatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b772e5-0bbf-41ec-81af-a17a004eb4bd/77896921023.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0470/9538/2174/files/walmart_open_laptop_return_policy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/the_mine_song_remix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3594/1285/files/amharic_bible_for_mobile.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2947/9072/files/multi-user_operating_system_examples.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_off00005edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDB 5464 bytes
SHA-256: e1348df2d185052f12019d3f77753a8af37af49f6fe7a8cf02a27cf6bf7f3cda
font_01_sfnt_off0000715a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x715A 9796 bytes
SHA-256: d8ce28408b9433add2031d7bb618e00f07bca1d97e94a3dc129d259e74ebfcfa