Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bb81e0f0bcee6b…

MALICIOUS

PDF

80.3 KB Created: 2021-04-02 15:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ba351a196c4babb5938f2a496d3b5d6 SHA-1: 54e7cf38f3109994ecf918e92c4046236811833a SHA-256: b4bb81e0f0bcee6bc8aa6697de45bdf39cc7200536196a5c9207ce5e689972dd
96 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL suggesting a lure related to educational material. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external URLs and the PDF structure itself suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 4

  • 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://kuzutuzo.ru/wix?keyword=graphing+sine+and+cosine+worksheet+gse+pre+calculus
    • https://cdn-cms.f-static.net/uploads/4419818/normal_60167ee41a4e2.pdf
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/luviromapovam.pdf
    • http://vonokumi.iblogger.org/fonesufizovapofubivovufiv.pdf
    • http://reduslim-italia.website/enthalpy_of_solution_lab_report_discussionm78wy.pdf
    • https://fofumizuzel.weebly.com/uploads/1/3/2/7/132740209/2315531.pdf
    • https://vopoxeja.weebly.com/uploads/1/3/5/3/135346001/roxenodepo.pdf
    • https://static.s123-cdn-static.com/uploads/4414701/normal_5fcbb5df4288f.pdf
    • https://jasebezaf.weebly.com/uploads/1/3/4/6/134630561/nukofabu-reredizo.pdf
    • https://static.s123-cdn-static.com/uploads/4417669/normal_600387bf4e042.pdf
    • https://cdn-cms.f-static.net/uploads/4386087/normal_6055309c2eb1c.pdf
    • https://static.s123-cdn-static.com/uploads/4470524/normal_5ffd83bf5fb61.pdf
    • https://cdn-cms.f-static.net/uploads/4446388/normal_5fd76cf70b25d.pdf
    • http://useporte.xyz/siweritebubapufipirnlj0.pdf
    • https://panikudar.weebly.com/uploads/1/3/1/4/131437701/8800622.pdf
    • https://static.s123-cdn-static.com/uploads/4459329/normal_5fde0b7a7134c.pdf
    • http://makeyourself.xyz/kojopufap1ty7o.pdf
    • https://static.s123-cdn-static.com/uploads/4465403/normal_5ffbe19948bbd.pdf
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5fed3b1ac49de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://niniraxezu.rf.gd/78394771124.pdf
    • http://bogurivesinoni.rf.gd/pikejabifuzirepave.pdf
    • https://s3.amazonaws.com/womirofop/insurgency_sandstorm_performance_guide.pdf
    • http://diwifesatikebak.epizy.com/wibapamu.pdf
    • https://s3.amazonaws.com/zubata/disneyland_paris_minecraft_map_download.pdf
    • https://s3.amazonaws.com/somisilegex/nobezanipuxosuxevazasuti.pdf
    • http://geketugasu.epizy.com/rofutabubanavugex.pdf
    • https://s3.amazonaws.com/gofilafixu/47761172769.pdf
    • https://s3.amazonaws.com/vipuxafol/megavobixolowari.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_off0000f8fe.bin
36cd5d6dc325338744849925180340611c310c107d0210c7874d332e94b9d67d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 5520 bytes
font_01_sfnt_off00010bd0.bin
5d01f380bba58f9b0cb16775a3d57874b28fa09197cccd9ab59cd2b14bbd2e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 11512 bytes

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