Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d9f773531f1ac0…

MALICIOUS

PDF

46.7 KB Created: 2020-10-07 13:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e680fdd1d8f7ec04d0ca387a5a3946ed SHA-1: b095c7ef13798c2545c723328ce42c770fdd9d2e SHA-256: e5d9f773531f1ac0acc96297a8f5d992a81c80bb29a1a4d790c229919e44e921
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many pointing to disposable hosting and redirector services, indicating a link farm designed to manipulate search engine results or distribute malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were extracted, the structure and URL patterns strongly suggest a malicious intent to redirect users to harmful 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://ggtraff.ru/strik?keyword=les+4+fleuves+du+jardin+d%2527eden In PDF document text
    • https://site-1036924.mozfiles.com/files/1036924/tutakum.pdfIn PDF document text
    • https://site-1040132.mozfiles.com/files/1040132/jibuvofozusijosilif.pdfIn PDF document text
    • https://site-1040977.mozfiles.com/files/1040977/wafiraxawobadegevupovo.pdfIn PDF document text
    • http://ratodogob.clockpartsplus.com/uploads/1/3/0/9/130970009/dijulev-nanubiwerifuluw-pakulixowawem.pdfIn PDF document text
    • http://zefovuneg.g6equip.com/uploads/1/3/1/0/131070934/1715373.pdfIn PDF document text
    • http://files.stephparisi.com/uploads/1/3/1/0/131071167/gekolupodu_pifekukefaza_pazojap_besisur.pdfIn PDF document text
    • http://files.cdietconnections.com/uploads/1/3/2/7/132741556/7952327.pdfIn PDF document text
    • http://mabupi.royaleliteweeksrental.com/uploads/1/3/1/4/131408183/9742439.pdfIn PDF document text
    • http://files.wichitafallsbridge.com/uploads/1/3/1/6/131606128/624ac.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/2d32517d-5cea-449c-931b-d3e563618020/wojajox.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_off00007412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7412 5100 bytes
SHA-256: d5928f3242ce004e2377d05d8d1bbb1d58a759baf5739e7d11e3ab46de39805a
font_01_sfnt_off00008597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8597 12304 bytes
SHA-256: 81f6a6cabb804de3a0efece6073fb527abbd276c0401028b0e016300aaabfa5a

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