Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c66ed153ae713d…

MALICIOUS

PDF

72.1 KB Created: 2021-03-17 22:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e31b8ba6296e6eaf906509db7008d7ec SHA-1: 11dfe95598c90f44119c80220a3569a6de027854 SHA-256: 89c66ed153ae713dcb08dcaab08ffe08b5b0545eb4d0296186b777c46ed90d2a
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and ML classifiers, and it contains links to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to product searches, directing users to potentially harmful sites like dafemum.ru. The presence of numerous PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

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
  • 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.
  • 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.
  • 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://dafemum.ru/wix?keyword=spiderwire+sunglasses+price In PDF document text
    • http://milanomoda.site/fl_studio_12_download_for_windows_7uutwa.pdfIn PDF document text
    • http://circulyarkadigital.xyz/41588285809wf5tf.pdfIn PDF document text
    • https://cdn.sqhk.co/salavogi/gf7jdgf/order_confirmation_template_shopify.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/diPGjcH/futanadoximivoxape.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_fcb7e94c20f647029ed9d2315ca0e507.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e30abe0-e971-46cf-94cf-4bb4660fabb1/jidala.pdfIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_00999b4f19284d1c8e78a7c11d4985b6.pdf?index=trueIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_da1c2c24c99a4355b7584ff6703e42d0.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_a4f32201e8a244018de89038e5fbeb1c.pdf?index=trueIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_7c651690b4234a299ec1167f06b071fb.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_f8a1c2c3bc9b4e32914728a2b3f8bb45.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_80102c13f1974c9b8ed07b885ad93d64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a07e9e1-112f-4707-8c03-4d19ea943001/kerosene_heater_parts_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad607477-1e09-4609-8cc2-4cd9d0b7da56/dabelomiwot.pdfIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_2630321227c34b1dbd240c84a296f371.pdf?index=trueIn PDF document text
    • http://gekuvilis.epizy.com/69560963008.pdfIn PDF document text
    • http://mewexudidis.epizy.com/vb._net_2017_express.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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 5436 bytes
SHA-256: 71199346aec5c14d6702b617df72674736606895119f7171516aab00fb9fd2a3
font_01_sfnt_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 12872 bytes
SHA-256: f96f8410d069bf5a32f3df43d8e2f5dab567f80bd2616a5a7cea3f329b1e83a6