Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fe5d0b2b509bfc…

MALICIOUS

PDF

80.2 KB Created: 2021-04-05 13:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a55cf2243028fdff41a5a891be1b8b4 SHA-1: 7bf3023c53fc94c6707011b4dacea35d7d41ff1f SHA-256: b8fe5d0b2b509bfc86ce5cbd2c54faa78f9e4b35f0140c5df112953bf51d09e7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farms or phishing campaigns to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to host or link to malicious content.

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://botokaw.ru/wix?keyword=representation+theory+conference+2020
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/1200113.pdf
    • https://cdn.sqhk.co/nidebuwe/hfgjMie/sync_gmail_contacts_in_outlook.pdf
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/9c1c97ba64829.pdf
    • http://towufato.mywebcommunity.org/chasquido_articular.pdf
    • https://cdn.sqhk.co/fiporalisu/9hfhhgh/mavitedomeledus.pdf
    • http://ninuxalezopo.getenjoyment.net/genetics_test_questions.pdf
    • https://cdn.sqhk.co/popaxutu/XHihLie/5_seconds_of_summer_album_all_songs.pdf
    • https://cdn.sqhk.co/dawolesirip/dheiLij/75402867825.pdf
    • https://wotipivas.weebly.com/uploads/1/3/1/4/131482993/juxupif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_0a15c17d4d8945a6a5c887ce7e36d5e2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/612c39ee-5cf7-4c1b-9792-d96d849c1ba7/average_material_science_engineer_salary.pdf
    • https://uploads.strikinglycdn.com/files/19485e8a-cc09-4766-a4d0-494c7aaf945c/c_programming_a_modern_approach_2nd_edition_ebook.pdf
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_23ea6ac1951e49b4b2cdbb450564473e.pdf?index=true
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_8163783073a24b53963cf56dbdef75e8.pdf?index=true
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_4f831676b2ba4520bd97c44a07fa3bdf.pdf?index=true
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_97c15d1347634c9580663131007d4231.pdf?index=true
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_99779e2286a44e528d1abedf7c6092bf.pdf?index=true
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_9c497a73adaf489880c359bc05779dd0.pdf?index=true
    • 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_off0000f8b1.bin
0600df70b72ec09606db4e98517902634c210b5a873931cfa725083bd2b6fea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 5456 bytes
font_01_sfnt_off00010b43.bin
bb9c899088bb8520770fc8009c48c92a9827529763439fd051d08855cc543537		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 13356 bytes

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