Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab64705ce892c578…

MALICIOUS

PDF

83.7 KB Created: 2021-03-30 16:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70266e7798dd8f524f06e801a473694a SHA-1: 251c7c2e73744b96b5cb82b85cb11af23861c3e8 SHA-256: ab64705ce892c578fe4c0ecd830a5c440de3cdaf8ba3db2640a23aceceffd263
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document body, though partially corrupted, suggests a lure related to 'chemistry workbook answers chapter 7'. The presence of numerous embedded URLs points towards a phishing campaign aiming to redirect users to malicious content, likely other PDF files hosted on various domains.

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://nipisod.ru/wix?keyword=chemistry+workbook+answers+chapter+7
    • https://cdn.sqhk.co/livatunozasu/oDdSpgc/new_cartoon_movies_2018_in_urdu.pdf
    • https://babiweperes.weebly.com/uploads/1/3/5/3/135347107/da698b.pdf
    • http://seomagnat1.online/cpm_answers_geometry_chapter_2jxhtz.pdf
    • http://pixenevalir.22web.org/16712830223.pdf
    • http://gazajujana.mygamesonline.org/vomosonojaxirelex.pdf
    • http://espaceabone.com/5850767862xo6xm.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/83700290254.pdf
    • https://tadudekum.weebly.com/uploads/1/3/5/3/135391719/f48240d365.pdf
    • http://andyhongdigital.com/dc_comics_wiki_lucifer15wqm.pdf
    • http://fomoregekamikat.mypressonline.com/bhu_ba_sociology_syllabus.pdf
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/376708891248984.pdf
    • https://cdn.sqhk.co/lirebirab/c2gdLfX/58908021394.pdf
    • http://fituxem.sportsontheweb.net/tokyo_ghoul_re_kaneki_comes_back.pdf
    • http://ruxuzosok.mywebcommunity.org/xegot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lixanixuzuki.rf.gd/32012009885.pdf
    • http://webubekesivamuf.epizy.com/forensic_reports_dmarc.pdf
    • http://jibeginogib.rf.gd/60469873285.pdf
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_e3df9bd3720b40f48653a000304323a8.pdf?index=true
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_2673209f87f24eda8675743fb4d3f948.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f324.bin
a2b787bb56cb41d7cd035e6de9bd8ab2c23c5876c0d968e4fb33164c4d7cca87
pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 5524 bytes
font_01_sfnt_off000105d6.bin
ca187b7cc842560ada91bd553e62ca816ae63377658a1fa917932e69dfea6e0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 11224 bytes
font_02_sfnt_off00012c9a.bin
01918ab328aad74c9e8f640f01f786fd0c2e0e9f3673bd8045474dd117871356
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9A 16080 bytes