Malicious PDF — malware analysis report

Static analysis result for SHA-256 3162f10125447a9f…

MALICIOUS

PDF

85.8 KB Created: 2021-03-23 19:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4da94aeec0493b2bea5704a1fbcc2663 SHA-1: 81ffee30e616bf32e5b6d50e7569d885b8b29a31 SHA-256: 3162f10125447a9f5c554acd0cb08b9b75f43fe132d7b154cc84ece5aa6659cc
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'nipisod.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'Kamado tanjirou no uta piano sheet', indicating a social engineering tactic to entice users to click the malicious link. No scripts were extracted, but the presence of external URIs and the overall malicious classification strongly suggest an attempt to redirect users to a harmful resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/123?utm_term=kamado+tanjirou+no+uta+piano+sheet
    • https://cdn-cms.f-static.net/uploads/4470977/normal_60290f5c00995.pdf
    • http://filemarker.store/398201880108q1go.pdf
    • https://cdn-cms.f-static.net/uploads/4486537/normal_60517fa29a865.pdf
    • https://static.s123-cdn-static.com/uploads/4480403/normal_5fcf45a87c82e.pdf
    • https://cdn-cms.f-static.net/uploads/4467945/normal_60366b88cd6ec.pdf
    • http://mamunetosi.iblogger.org/46740296759.pdf
    • https://cdn-cms.f-static.net/uploads/4411923/normal_603944d1ddadf.pdf
    • https://cdn-cms.f-static.net/uploads/4366957/normal_6020fb1348442.pdf
    • https://cdn-cms.f-static.net/uploads/4375073/normal_6046c2e442485.pdf
    • https://cdn-cms.f-static.net/uploads/4365536/normal_6048d835b907c.pdf
    • http://shtangye.xyz/qsc_rmx_2450_weightdpwua.pdf
    • https://cdn-cms.f-static.net/uploads/4421048/normal_604916de66dc6.pdf
    • https://cdn-cms.f-static.net/uploads/4454184/normal_6045e6bacefed.pdf
    • https://static.s123-cdn-static.com/uploads/4370529/normal_6006345646b56.pdf
    • https://static.s123-cdn-static.com/uploads/4370265/normal_5fe0a5d861d19.pdf
    • http://rentline.pro/past_tense_verbs_for_esl_studentsljhkv.pdf
    • http://bilkaita.space/279137759049zo5f.pdf
    • https://cdn-cms.f-static.net/uploads/4426972/normal_604497667924e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bewegaxijev.rf.gd/english_grammar_assessment_test.pdf
    • http://fafimogesomizak.rf.gd/troy_bilt_generator.pdf
    • http://metusajixano.epizy.com/correct_answer_if_you.pdf
    • http://jowelijarav.rf.gd/dabejutatolutojebabasu.pdf
    • http://labopum.rf.gd/caustic_3_android_sequencer.pdf
    • http://rodidop.epizy.com/pajitudilufono.pdf
    • http://rowopiva.rf.gd/asus_file_manager_apk_apkpure.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c0.bin
6427738721860e3d8320cacd177e8f6e89ea480cf445d5390859bcd86d1e923c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 3644 bytes
font_01_sfnt_off00010fbd.bin
a10a4966c1f75734f9132e0bdb3e954634f925d4896d96daac1c89cd150c49d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 5212 bytes
font_02_sfnt_off00012152.bin
c7434fedefef9f8ec5e37617fbb93849612fd08cc95481cf6ef1ebb617b8e63b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 11936 bytes

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