Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e181f05702c0d43…

MALICIOUS

PDF

65.8 KB Created: 2021-02-26 02:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1bfe8275e72fe23ddcc7166720a5d4e0 SHA-1: 5d66cc2d9cc57d1de27c0844396c7114d430fce6 SHA-256: 1e181f05702c0d43a5cf49093a4989177fef04a0e7cd1ab6a2edfea3e5b2cc03
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and potentially malicious PDF files, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure suggests it's designed to redirect users to potentially harmful content, possibly for SEO spam or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://druttle.ru/wix?keyword=animal+farm+chapter+5-7+quiz+answers PDF link annotation
    • http://opensalon.xyz/843594847547ddv3.pdfIn PDF document text
    • http://lnstagram-helping.live/v2203_kubota_engine_parts_listad6nh.pdfIn PDF document text
    • https://surudebed.weebly.com/uploads/1/3/4/5/134513173/vusulunid.pdfIn PDF document text
    • http://mir23.xyz/all_time_flower_treerxxrf.pdfIn PDF document text
    • https://taralibupub.weebly.com/uploads/1/3/4/3/134372711/5157238.pdfIn PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/parovesunele-lubewezib.pdfIn PDF document text
    • https://diwujuxopawarow.weebly.com/uploads/1/3/0/8/130874606/8288268.pdfIn PDF document text
    • http://parrrtner.xyz/informant_meaning_synonymc94uo.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/bajopovogebexetujaxe.pdfIn PDF document text
    • http://marketitaly.info/samuel_beckett_waiting_for_godot_themesrfavf.pdfIn PDF document text
    • http://pr-bux.online/171356797480wa63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F2 5748 bytes
SHA-256: b0d78c352679bc4145a406cb6ff58cf0194002b676cb73db5ab1116ecd2d3a46
font_01_sfnt_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 10264 bytes
SHA-256: 6e4f3bfa1d39bf0134a85fdb3311f5d292c404716c7bc90584efd384865f3968

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