Malicious PDF — malware analysis report

Static analysis result for SHA-256 427416421b53999b…

MALICIOUS

PDF

73.8 KB Created: 2021-02-28 05:31:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ad4c76064435ef98a91081c8e590a614 SHA-1: c19e13686959d458f51ac97b69e233c27e0e74eb SHA-256: 427416421b53999be4987cf2703c621080d3356985151c93995bb0b2e978b6a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The document body, though heavily obfuscated, contains text related to "Grundfos pump manuals" and application metadata, suggesting a lure to trick users into visiting these external sites. The ML classifier also strongly indicated maliciousness.

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://seumenha.ru/award?keyword=grundfos+pump+manuals PDF link annotation
    • https://mupoveno.weebly.com/uploads/1/3/4/3/134371030/803650.pdfIn PDF document text
    • https://mojavopadagesit.weebly.com/uploads/1/3/5/3/135383036/59d73f6a0a.pdfIn PDF document text
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/8b693685a5f.pdfIn PDF document text
    • http://dadosib.22web.org/android_automation_testing_using_python.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412160/normal_60032683d044a.pdfIn PDF document text
    • https://fudesatalaponu.weebly.com/uploads/1/3/2/7/132710537/76e09c2280b77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_600cb3ba2b185.pdfIn PDF document text
    • https://vugifalufaduzo.weebly.com/uploads/1/3/4/8/134889855/viwotefur.pdfIn PDF document text
    • http://pabulaluxe.iblogger.org/11217281936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459322/normal_602d9e866810a.pdfIn PDF document text
    • https://jitivafume.weebly.com/uploads/1/3/0/9/130969372/mizimigam.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/legapatatezisa/2019_bollywood_horror_movies.pdfIn PDF document text
    • http://giratas.epizy.com/extraction_of_essential_oils_from_aniseed.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/79837081127.pdfIn PDF document text
    • http://fanobibefo.rf.gd/what_defines_a_roman_catholic.pdfIn PDF document text
    • http://ludujefu.epizy.com/14542192290.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/canadian_armed_forces_pension_forms.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_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 5220 bytes
SHA-256: 461e6dbe65a77b5b84978c0c177228fa71405dc7c0816acfe9d8079c01ff3389
font_01_sfnt_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 10576 bytes
SHA-256: fcca071809f135f0ae669c2f5fbcfe3eab1b7df7229e698b8c413bec3c64773c

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