Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b370fd107a51419…

MALICIOUS

PDF

75.0 KB Created: 2021-02-25 05:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da30f04627ddfa3f962bea1b128dddae SHA-1: 082c4221c6402913dc693fbd136328280dc8b54d SHA-256: 4b370fd107a51419f9115e533b061939d816d5ba4adbf59b6f535489dc2a2c15
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that, when clicked, leads to a page related to '8th grade social studies staar test answers', suggesting a social engineering lure. The presence of embedded URLs and the nature of the content point towards a phishing or malware distribution attempt.

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://bologen.ru/wix?keyword=8th+grade+social+studies+staar+test+answers
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/8ec0ff0e.pdf
    • https://cdn.sqhk.co/ditutafewaw/SldhiLf/98474724956.pdf
    • https://cdn.sqhk.co/jogibigeda/P3Uhg7K/superstar_life_mod_apk_ios.pdf
    • https://cdn.sqhk.co/bipozipo/hl1hbjh/demilo.pdf
    • https://cdn-cms.f-static.net/uploads/4488556/normal_601fada78ea16.pdf
    • http://tixesikixux.mygamesonline.org/rojagizajatutilenagasuw.pdf
    • https://static.s123-cdn-static.com/uploads/4427785/normal_60012fb0ae764.pdf
    • https://cdn-cms.f-static.net/uploads/4408701/normal_602064bd9dd8c.pdf
    • https://cdn.sqhk.co/daxerarugak/hejbjjD/german_ww2_warbirds_for_sale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/robumuduluwise/motu_patlu_cartoon_java_game.pdf
    • http://zaxesagujudiwa.epizy.com/jevutexosozogoniturukefov.pdf
    • https://s3.amazonaws.com/wonumafubij/excel_formula_to_multiply_two_columns.pdf
    • http://lifugefumiwikoz.epizy.com/golujenezuzomujuj.pdf
    • http://todonoto.epizy.com/best_of_nachiketa_album_free.pdf
    • https://s3.amazonaws.com/mikibetiv/73049544005.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_off0000e900.bin
6298fa4e5dc247540eed52217b69594016268bd858b2e899b9660aa795bca0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 5392 bytes
font_01_sfnt_off0000fb5b.bin
35d84f0b6c164f762e036d9a4f94bae2f1c48bb9d20e503e7371ba22bc332331		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 10412 bytes

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