Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfe7d1f19c7cdd1…

MALICIOUS

PDF

81.2 KB Created: 2021-03-14 22:35:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4477d7bc734417ac811e08d0cfa60b06 SHA-1: e3d7fca2ce7c1cdc9934a3df210fb1154bd5a44f SHA-256: fcfe7d1f19c7cdd162232c27cd1c68fe4a9d2e437f248a76ade84ecf31a2f844
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'zajinet.ru', which is likely part of the phishing or malware delivery mechanism. The document body, though heavily obfuscated, suggests a lure related to 'sparknotes'. No scripts were extracted, but the PDF structure itself facilitated the malicious URL embedding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=jude+the+obscure+sparknotes
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5fdc52fab8720.pdf
    • http://healingtunes.ru/noruwazv9nr.pdf
    • https://static.s123-cdn-static.com/uploads/4375703/normal_5fcf094c2bef7.pdf
    • http://gonzo-3d.com/icebreakers_ice_cube_gum_flavorscqov8.pdf
    • https://static.s123-cdn-static.com/uploads/4495240/normal_5fc664def1680.pdf
    • http://ketaton.mywebcommunity.org/avalon_astoria_pellet_stove_troubleshooting.pdf
    • https://static.s123-cdn-static.com/uploads/4461763/normal_5fe4031b683e6.pdf
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5fe1f27e91a3c.pdf
    • http://kazaxukiga.getenjoyment.net/sixth_sense_technology_ppt.pdf
    • http://zhigina.ru/49457969523gpolb.pdf
    • http://trysol.xyz/best_essays_in_slouching_towards_bethlehemvs59u.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dexodekelaseki/napimerekojexavu.pdf
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_e9524f1e50d249de972b3ec892c51ee9.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_2a2a8bd26de14b52b08c27d8708f1a77.pdf?index=true
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_3493862cb75c4e3a82bf9e438f8a23bb.pdf?index=true
    • http://somasetowijo.myartsonline.com/mass_moment_of_inertia_of_different_shapes.pdf
    • https://s3.amazonaws.com/juzewojavomofew/zufumepes.pdf
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_2040717d84414c83828967db2fcb2884.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e7.bin
d6e9d4374a5bc8f403db86fe376fef962d50405144f4f5726a57a873577f8853		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 5156 bytes
font_01_sfnt_off00010750.bin
8cddb22e7f69d89183159e7574d5c6cbd785ea993c5a9ec9e02ba63695be03a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 10116 bytes
font_02_sfnt_off000129b4.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129B4 4324 bytes

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