Malicious PDF — malware analysis report

Static analysis result for SHA-256 1953cde79d45392d…

MALICIOUS

PDF

76.9 KB Created: 2021-03-15 16:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e81fe8f0c7fdc48f490e2ad8935b6a35 SHA-1: 77fba96e983d44e1358537924cc560d0b4ba7157 SHA-256: 1953cde79d45392da3b9a03e1bc702e8757a6b65a217e7f58f02bdb0147c8192
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm with numerous external PDF links, including one to 'maypoin.ru', suggesting a SEO poisoning or phishing campaign. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/award?keyword=mathematical+logic+ebbinghaus+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456999/normal_601548a23f6bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_5fe9097e934f5.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/ce86ca.pdfIn PDF document text
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/zorafomesifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425237/normal_5fffa654039fd.pdfIn PDF document text
    • https://fuzaterolipi.weebly.com/uploads/1/3/1/4/131438829/visawewasepat.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/b256566f-90ba-45f0-a4b2-13722d14f5a3/20713936965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90e781b-b43c-4ba8-846a-474692981f70/zozatawitazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b6fc10-ba43-409d-bc67-abecca184b2d/makuvodusozabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a4bb09-a7e5-4582-9a66-5b78d925d3a3/mezojewasujomixibunabazo.pdfIn PDF document text
    • https://d2d110b1-dce0-4b0c-bed7-be24280b7a6e.filesusr.com/ugd/165585_5ab364f7d3bd473e9d893f0431d6832a.pdf?index=trueIn PDF document text
    • http://jetelusaxidu.epizy.com/winter_wonderland_sheet_music_violin.pdfIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_0e6e35fd70e444759e233996de6db796.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b900aa-b106-4084-9107-2962cb431e5c/bizesuvoguvejubogoladogug.pdfIn PDF document text
    • http://rinevagu.epizy.com/isometric_grid_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11bc717-6407-4ba4-a772-1f5f73b3eaed/datofobimolujuvakekos.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_275424b5e89946a988f2fb3ba251a01b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ada8e6a-a47d-4b2c-acd2-cded5cd49ef5/are_taylor_kitchen_scales_accurate.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_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 5616 bytes
SHA-256: 777ab3e3beb2a1c772734409a47f72fcf7466a709b942b78724a2ae6d36c01f2
font_01_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 10716 bytes
SHA-256: e2bb573d4e24674480f9e4f2695f41880410c98c2c18c0c1ba1bd434100bdb24