Malicious PDF — malware analysis report

Static analysis result for SHA-256 e576a26d7e939eb5…

MALICIOUS

PDF

86.0 KB Created: 2021-04-18 21:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a4bd4429147084853f379022c4a8de0 SHA-1: 414622773e4dc17081241f3b69ed2234d73647d1 SHA-256: e576a26d7e939eb530f27e8d99ad3570c2d1619105cf30493dbdfbfeb3eaaab1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing operation. The primary URL, https://dafemum.ru/strik?utm_term=a+letter+to+my+nephew+pdf, is likely used to redirect users to a malicious site, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://dafemum.ru/strik?utm_term=a+letter+to+my+nephew+pdf
    • https://cdn.sqhk.co/pabelewexo/jhn7GKL/fuvibomuwuzepapawe.pdf
    • https://cdn.sqhk.co/kitujesijak/eHjhehe/ways_to_improve_traffic_calming.pdf
    • http://vikorurapufor.iblogger.org/agenda_2020_de_las_naciones_unidas.pdf
    • https://munemajof.weebly.com/uploads/1/3/2/3/132302982/dovuj_zekapiguvofi_vegemepagipi_kixixenemazitum.pdf
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/f0277a999a72ff0.pdf
    • https://vekibapovadivoz.weebly.com/uploads/1/3/0/8/130873848/3182b0ee9.pdf
    • https://cdn.sqhk.co/gujowaxexag/hiictvx/rolling_sky_download_mac.pdf
    • http://lisuzigerob.mygamesonline.org/rixogur.pdf
    • https://cdn.sqhk.co/nanijamu/dpJuje2/tetris_apk_offline.pdf
    • https://cdn.sqhk.co/nokikijun/jivRjhF/posef.pdf
    • https://bugasezafefadi.weebly.com/uploads/1/3/1/6/131637254/rokexikesovi.pdf
    • https://labufixurugon.weebly.com/uploads/1/3/4/8/134873424/vimamibowedod.pdf
    • http://gepexoliv.medianewsonline.com/air_pollution_files_free_download.pdf
    • http://padojobimo.mywebcommunity.org/41664351844.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kuxegu/alpha_centauri_alien_crossfire_guide.pdf
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_814689dc950d4e72824c1322efff3872.pdf?index=true
    • https://s3.amazonaws.com/falufusu/tolstoy_hadji_murad_analysis.pdf
    • http://gepafelixadu.onlinewebshop.net/zetafatop.pdf
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_572dda7316db405bb47978d4b5b402f3.pdf?index=true
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_08264e9214ac4a80ad2f11aa3cea889a.pdf?index=true
    • http://kitukogoxav.epizy.com/zawegagex.pdf
    • https://s3.amazonaws.com/kisagoz/maloselovuzukas.pdf
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_2c26c11101bf4c2abae891673ec87360.pdf?index=true
    • http://zakexukosogu.atwebpages.com/ayyappa_swamy_telugu_songs_lyrics.pdf
    • https://s3.amazonaws.com/bidivo/casi_grade_4_reading_passages.pdf
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_d6c75a53bb61452ba84af89af7fb2053.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_off000110ee.bin
aa11fef65ad1c23e5b88bd6d5eba779b7cf22ef53e86bb48121be4582691dc79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110EE 5076 bytes
font_01_sfnt_off00012221.bin
8fe424a0dff3a185834f8162f99febb52152ec89933b2b4ba50b6a7f6e3de231		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 11544 bytes

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