Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafb849087f05695…

MALICIOUS

PDF

81.6 KB Created: 2021-05-02 04:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6b1dcf887a3e49d6cde54bbe9b2bc03 SHA-1: d5b31f4ad92c3d40ef7d93016d7af5ff2e8014ff SHA-256: cafb849087f05695e6e9b1eed2df93408885695cab98944e9089e78fc66cdfaf
136 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. The document body, though heavily obfuscated, contains text related to a 'winchester safe beeping' lure, which is a common social engineering tactic. The presence of external URIs, including one pointing to 'jumiwimov.ru', suggests the document is designed to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jumiwimov.ru/strik?utm_term=why+is+my+winchester+safe+beeping
    • http://nomevufaneboja.mypressonline.com/cinderella_solution_quick_start.pdf
    • https://cdn-cms.f-static.net/uploads/4390052/normal_602aa8421dd5f.pdf
    • https://static.s123-cdn-static.com/uploads/4486192/normal_6005dd86d6417.pdf
    • http://xevusezes.medianewsonline.com/advantages_of_selective_incapacitation.pdf
    • https://cdn-cms.f-static.net/uploads/4370090/normal_601cfd4ca737b.pdf
    • http://kobivoweder.mypressonline.com/cumulative_normal_distribution_table.pdf
    • https://static.s123-cdn-static.com/uploads/4403687/normal_5fcf729610a73.pdf
    • https://cdn-cms.f-static.net/uploads/4458635/normal_6024fc85cc1a0.pdf
    • https://static.s123-cdn-static.com/uploads/4378834/normal_5ffa274f6360e.pdf
    • http://ramuwesitavoz.mywebcommunity.org/zigubitegebikote.pdf
    • https://static.s123-cdn-static.com/uploads/4404969/normal_5fca2135c80a5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://s3.amazonaws.com/potamotaz/empire_halo_too_speed_feed.pdf
    • https://s3.amazonaws.com/jeponowon/sagubi.pdf
    • https://s3.amazonaws.com/timituvupame/94051928178.pdf
    • https://s3.amazonaws.com/jizubisetebof/47357928798.pdf
    • https://s3.amazonaws.com/zozuxukoxo/thyroid_storm_clinical_practice_guidelines.pdf
    • https://s3.amazonaws.com/kugelilizibuwum/fumisakonelamevelaviteb.pdf
    • https://s3.amazonaws.com/gixirojozogufux/descargar_adobe_flash_player_apk_pc.pdf
    • https://s3.amazonaws.com/varolexexus/grave_disease_guideline.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee32.bin
5fba886a39ee73c681c07e02059bcaf65bce71dc3227877b0773ff9bbdfee90a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 5744 bytes
font_01_sfnt_off000101b1.bin
0b8363bc9e07cf89205331d27bc1c31e4fc91592bb846ce71245372e642e4983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 6148 bytes
font_02_sfnt_off00011191.bin
bbdd8d827f0f5fa6cdbe21077b9355f0a9829a99d25d8caac4fc0a8c5174e4a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 11404 bytes

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