Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2ce68f1f066757…

MALICIOUS

PDF

32.6 KB Created: 2020-10-05 02:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 36e4750697dfd13534aeeec2ca5eaf01 SHA-1: ec5872514bea73a2a79c79dc5f0d4488b12b2fd0 SHA-256: 7e2ce68f1f0667570a736e0bf7a303c0b94986c6e8e0fbe29a8ee7993f33784a
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable domains and redirect to malicious infrastructure. The document body text, though partially corrupted, includes a URL that is also present in the list of malicious links, suggesting a lure for users seeking 'diagnostic microbiology pdf free download'. The ML classifier strongly indicated maliciousness, and the link farm behavior is a known tactic for distributing malware or leading to phishing sites.

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.
  • 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://gettraff.ru/strik?keyword=diagnostic+microbiology+pdf+free+download In PDF document text
    • http://files.sophiemasloff.com/uploads/1/3/0/7/130775837/36077d8ab0be.pdfIn PDF document text
    • http://vuxon.armahart.com/uploads/1/3/2/6/132683438/9114151.pdfIn PDF document text
    • http://nejaza.decoloresfarm.org/uploads/1/3/2/6/132695569/397a52.pdfIn PDF document text
    • http://wekina.asianyoungmusiciansconnection.com/uploads/1/3/1/6/131637131/8c4707dd38ab.pdfIn PDF document text
    • http://dizol.laketahoemarkets.com/uploads/1/3/1/6/131606069/fomaviga.pdfIn PDF document text
    • https://site-1038913.mozfiles.com/files/1038913/28961088577.pdfIn PDF document text
    • http://files.ladiesinpigs.co.uk/uploads/1/3/1/1/131164252/tonus-tijetadubo.pdfIn PDF document text
    • http://files.uilmusicregion6.com/uploads/1/3/1/3/131382113/buporinidavam.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/7239e961-12dd-4e44-b23b-579ee15a61ca/44262032673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9edf8ca-260e-4a50-ac7c-2b394e89bcbb/93569695944.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_off0000441f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x441F 5808 bytes
SHA-256: 3f42e2d31c0c2283c3a4279bb4634f59cd359a380502219244a1d183dc033308
font_01_sfnt_off000057f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57F0 8732 bytes
SHA-256: 583dd12635d0194b9623a1a91d2518bcf2e48454513f1037f41bada74450e160

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