Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d927443276874c0…

MALICIOUS

PDF

101.5 KB Created: 2021-04-11 09:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d58a457a9edabd81d5a7a753a61fb885 SHA-1: 7582fda394acba6d736796a0dc829f37ddfe7cbf SHA-256: 1d927443276874c036564ca458600c13061e1f32841309202b72fd709482594c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated or use suspicious domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to external sites.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=their+eyes+were+watching+god+chapter+3+symbols
    • http://steblin.pro/acer_xg270hu_mountcd9tu.pdf
    • https://fikoroviv.weebly.com/uploads/1/3/0/7/130740338/c39649b37.pdf
    • http://defi-bet.world/lafetutubijilebutigolifukrc9yq.pdf
    • https://rexakutomas.weebly.com/uploads/1/3/0/7/130739652/2801468.pdf
    • http://salea.site/22206995058o1jfh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_b7d10f6f596f42e79bfbd5b244cf301b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/36c362ec-5ecf-492b-8b43-f1aae960d2e6/9010767931.pdf
    • https://uploads.strikinglycdn.com/files/bfb5266e-dab4-4b3e-a6d0-57a0d7261c49/is_white_fang_a_good_skateboard_reddit.pdf
    • https://s3.amazonaws.com/xezujuxoz/69895990390.pdf
    • https://uploads.strikinglycdn.com/files/6d871538-aabc-42cd-9cfc-199166b02eeb/why_is_my_xfinity_router_blinking.pdf
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_c5ebad7deff6490086d4b7e3ee0acecc.pdf?index=true
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_395b9c4859a54360b78c3c3256a6759d.pdf?index=true
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_1420b6bfba324252a55c5055c007174d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d012318c-8ce3-4f03-b005-eb894f03a5db/78666408694.pdf
    • https://uploads.strikinglycdn.com/files/2d1854c7-6117-490a-b017-5a69d5502959/libasafopagafevifo.pdf
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_1f5a52950d674b719fb30f7f8da9971f.pdf?index=true
    • https://s3.amazonaws.com/ronatiduzoxij/free_blank_map_of_continents_and_oceans_to_label.pdf
    • https://s3.amazonaws.com/jadudusujuje/super_fast_vpn_apkpure.pdf
    • https://uploads.strikinglycdn.com/files/8a614d74-dc0e-431e-b9ef-c4776cdaf858/serge_lang_undergraduate_algebra_solutions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014eb6.bin
79e82908d8107840303a851ec0f9243fb3c4e998e62505cc371b439b440f64f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB6 5936 bytes
font_01_sfnt_off000162d2.bin
1b21da71143406d53f966be93721f93fbecc8379c3bf85c52b90bf968cc68713		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162D2 11212 bytes

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