Malicious PDF — malware analysis report

Static analysis result for SHA-256 501c5a7e9403c286…

MALICIOUS

PDF

85.7 KB Created: 2021-03-24 00:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 452d10a3f7c03aebdea58e1eac983512 SHA-1: 21659cfcd88902350ec95bf00ecbb0664a337f9a SHA-256: 501c5a7e9403c2860e433ec1369f1fff3f5fdbd5ae42aa56ad599ffe89e34993
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, directing users to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wix?keyword=worksheet+transformations+of+quadratic+functions
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/1733968.pdf
    • https://cdn.sqhk.co/rijomawonuj/Ficibje/my_song_piano_chords_labi_siffre.pdf
    • http://jolovomolosubi.getenjoyment.net/xogakuf.pdf
    • https://tatefazaseg.weebly.com/uploads/1/3/4/0/134016926/tevavanimidimuniraf.pdf
    • http://loneresel.mygamesonline.org/buzurigegexoxeluvusulukor.pdf
    • https://cdn.sqhk.co/woxemumi/dvIVPjc/wijetisabimapujugi.pdf
    • https://cdn.sqhk.co/konidadelan/gO5qO68/photomath_app_download_apkpure.pdf
    • https://julubagarod.weebly.com/uploads/1/3/2/6/132695517/d82f6152.pdf
    • https://static.s123-cdn-static.com/uploads/4379241/normal_5ff3f73666cff.pdf
    • https://cdn-cms.f-static.net/uploads/4426550/normal_6035ac774967a.pdf
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/vudizef-babaxo-farerotivetonum.pdf
    • http://nitapida.mywebcommunity.org/zafaxaxudafusizaxox.pdf
    • https://cdn.sqhk.co/sadirorig/fmBhbjh/bsc_magazine_september_2019_free.pdf
    • https://cdn.sqhk.co/guwuweri/ih7hbhg/2016_mclaren_p1_driving_school_game_download_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c3e780e1-a1ee-422e-80b3-2bf79490ff1e.filesusr.com/ugd/dc7b26_fe3e4320f8c84749bc485cf841094f4e.pdf?index=true
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_ba68b7aaae1146718ea031bdaa56c67a.pdf?index=true
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_a30e6b8aa29642c0a3a491d8ffb9817a.pdf?index=true
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_84e5b63b311940d8bbee1cffe3fd296d.pdf?index=true
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_686a4049651c4bc191d2f8395dc9563d.pdf?index=true
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_6634ea3d24bd48bc91d427b0f8c7b95a.pdf?index=true
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_ffc8358168a84f29bb5fca0edf78213e.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_off00010e62.bin
2b43af37ee597f556bc44ed2c375ebf21c895c6937552e2414d1044634fa31fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 5432 bytes
font_01_sfnt_off000120c4.bin
cdd1c3e2c2aec40ebe5bffef5037f2ef1d7f135600d6d110e8c73bfc968cceef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 11896 bytes

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