Malicious PDF — malware analysis report

Static analysis result for SHA-256 5139493a34250b86…

MALICIOUS

PDF

50.6 KB Created: 2020-10-25 05:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e213f226abab9c75c666e8a2795fb1e7 SHA-1: 2efc34d9427f4c9cb828302df52276c21d1c9613 SHA-256: 5139493a34250b8603110bb13f4bcd4cbff66146bca258c3d09843a6f1024ad8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/123?keyword=sequence+words+and+phrases+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f9069646f9bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5f8bd2fee5b03.pdfIn PDF document text
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/77a28c621f99df.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/jikomaxazi.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/zuzotol-vosim-gamekowa-xoxabuwetadexe.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/firumiwuvezepo.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://cdn.shopify.com/s/files/1/0433/4157/8399/files/impressora_hp_deskjet_2546_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2931/8813/files/25748707835.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8339/1395/files/practice_butterfly_knife_comb.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/biology_in_hindi_file.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/8627127801.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/poultry_feed_formulation_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/80107191969.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/nofosesilifudukix.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/bibusakakonut.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/cashless_india_essay_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/36196390180.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/techniques_d_analyses_biochimiques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c911f0-9379-4a43-bbf2-72f52a3a7be3/41951019105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cdf4b45-6d8e-4a8f-804c-e96b8a1ff5e2/23524770359.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000677b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x677B 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0000776f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x776F 5348 bytes
SHA-256: d861adce0ee256d66c8b8d5f70c66c47ccbdde51e619293efd6e4ae5d95e3621
font_02_sfnt_off00008999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8999 10924 bytes
SHA-256: 710e821c2d3918b97c3d7cfb38c72e88f4d707c6579b2a7942da086735f58026
font_03_sfnt_off0000ae90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE90 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f