Malicious PDF — malware analysis report

Static analysis result for SHA-256 72497fb664f3aa70…

MALICIOUS

PDF

73.5 KB Created: 2021-01-23 13:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1d887f0d42674041a95ee76ec35c85e6 SHA-1: 8956dc075d19e865b95d648891c0b4d3199f5099 SHA-256: 72497fb664f3aa70354917c9b75531bb7b1dcefa62b553fec8cd165b35dd0e4e
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains embedded URLs that likely serve as the initial point of contact for downloading a secondary payload. The document body, though heavily obfuscated, suggests a lure related to educational materials, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/aws?utm_term=mathematics+8th+grade+textbook+pdf PDF link annotation
    • http://kodamup.22web.org/could_not_mapbox-_android-_sdk._aar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486965/normal_5fccd1b0b305b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500883/normal_5ff4c1f29bc94.pdfIn PDF document text
    • https://site-1176202.mozfiles.com/files/1176202/39337507043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505102/normal_5fe417864007c.pdfIn PDF document text
    • https://site-1192097.mozfiles.com/files/1192097/wuwuximelefikerogufiv.pdfIn PDF document text
    • http://golulim.iblogger.org/android_1_games_tom_gold_run.pdfIn PDF document text
    • https://site-1177462.mozfiles.com/files/1177462/forojetevavoli.pdfIn PDF document text
    • https://site-1171954.mozfiles.com/files/1171954/dixovez.pdfIn PDF document text
    • https://site-1172371.mozfiles.com/files/1172371/ccrt_art_and_culture_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450418/normal_5fdd00ec2574d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408863/normal_600bbc38312a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5fd8cb5768eb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/kutesumitoxe.pdfIn PDF document text
    • http://zoxokukazo.epizy.com/tasimoraraxovuxoworamib.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7F 6008 bytes
SHA-256: 9e1e66a415367a7db81db0ad58026e2fca77404c57887101e5924fcf37ab62b7
font_01_sfnt_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 12492 bytes
SHA-256: e81aad8a8aeca8b2e827dd1fbae5f751d98a3cc530c1ff5757b18694db25d21d