Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc210570531aa2c…

MALICIOUS

PDF

78.9 KB Created: 2021-04-28 04:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b5ee81bf6854e5b8ae6df00e9c6e9508 SHA-1: 1947e606023484b89db96b310916c038980c8f6c SHA-256: 5dc210570531aa2c88ad3431af86c2ac21aa8aba4d2c85a7c771cb2027a856e4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=leadership+secrets+of+attila+the+hun+pdf PDF link annotation
    • http://help-copyrightviolationhelpcenter.com/leaf_and_flower_anatomy_worksheet_answersj7dkk.pdfIn PDF document text
    • http://nanebaxexob.getenjoyment.net/jipedejulevuralewobik.pdfIn PDF document text
    • http://uanews.website/tonivubaboguxek66b3.pdfIn PDF document text
    • http://vixemifojetinag.sportsontheweb.net/gelagasewomelefimuvuzuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480595/normal_600f510ed44e5.pdfIn PDF document text
    • http://circulyarkadigital.xyz/fasokukimuvanoxexevanetiiv5yt.pdfIn PDF document text
    • http://podipotekoi.ru/what_does_neuromuscular_incapacitation_meanrtxun.pdfIn PDF document text
    • http://copyright-infringement.business/pozuwbkkom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_5fe7beedd1505.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/penguin_readers_level_4_vk.pdfIn PDF document text
    • http://shishkin-seed.xyz/adobe_illustrator_cc_2018_user_guidewuwks.pdfIn PDF document text
    • http://uabiomanix.xyz/hp_p2035_toner_refill0jah7.pdfIn PDF document text
    • http://lienforkid.com/pexupozanekamabexubivogaz0hcrp.pdfIn PDF document text
    • http://arthromedshop.xyz/867257346003wb6i.pdfIn PDF document text
    • http://mpvideo.org/72124680807okiab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_59edb9a9b3674bf5958a04cde3317b96.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_61ccb93df3fe403297acaa29af81586f.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_a7a6f40c2bb14a6c951cb7ea6c5cc64e.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_d346ba5d0f89489d98f644a26c0f29d4.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_ee3746aa7fdf4d1e829ac79bc2359f5a.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_1e81ec5341884389a1ee3407e00b7f72.pdf?index=trueIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_6016e1e4ca14480095e889164f760886.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_3678557029d74f4f88a87e74741e466c.pdf?index=trueIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_86acb435fc54417eb55cf110edbd9e3c.pdf?index=trueIn 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_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 5184 bytes
SHA-256: e28ceddc6c5fca51c63bdeb3cd08288dbb3f1cef88627e56a53f61684c1bba16
font_01_sfnt_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 11004 bytes
SHA-256: b5b857f6575643a9f1e8655e94696c858194e003415a4e5ea7ced7c59a342ecf