Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0a225f421e09b6…

MALICIOUS

PDF

67.8 KB Created: 2020-11-10 08:34:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: eb897aeceba17bc0d52dc835235dc6e3 SHA-1: bd71aaf0dc20f11afe8b6697df4079b2481988c6 SHA-256: 5b0a225f421e09b600eeec4354f464595e62d419edc524b01154bcc5ac2283f8
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain keywords related to a school website, suggesting a phishing or social engineering lure. The presence of multiple distinct hosts and disposable hosting in the embedded links further supports a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/123?keyword=chippewa+falls+middle+school+website In PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/welutemavaluli_rinudiladun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401989/normal_5f986d6de070d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_5fa2215da0228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_5f91b4fe7f94f.pdfIn PDF document text
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/3cf439a61fa15e8.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/jolabatejipigemazibe.pdfIn PDF document text
    • https://buwolerujagelav.weebly.com/uploads/1/3/4/5/134580081/bolofinuxexos_puxukev.pdfIn PDF document text
    • https://kifisiwa.weebly.com/uploads/1/3/4/2/134266158/8554294.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/faditobofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ae073b-5964-441e-9ff0-6bf447d2da36/96659676121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a922e884-e76a-4b51-927c-6e9bcfcb01b3/vozim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c13ff23-1fab-496e-b947-47809d7512ac/83774950200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74271374-c1b7-4d15-ad7a-95c63674ab5f/tikapamukabejubenapereda.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/97670321406.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_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 5436 bytes
SHA-256: 3468d5d8e312993cf0b17be26c1b6de6d228bfb4da2717036a712bb7bfb559b3
font_01_sfnt_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 10228 bytes
SHA-256: 2cc3b1e5b41f56e877a05f3ee21593b0aaee3a77e9d49a348d82e6d902a2a1a9

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