Malicious PDF — malware analysis report

Static analysis result for SHA-256 8498057828a4426d…

MALICIOUS

PDF

83.0 KB Created: 2021-03-23 09:15:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3db6063b1ce1ea5b1aa8b7d76b0ed362 SHA-1: b0e0482a7004ad6c64b1192618149c5c65627029 SHA-256: 8498057828a4426d257123ca1a41150d2626b63c8762b653086ffc0f6e6148fe
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, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://crophysi.ru/strik?utm_term=mcdougal+littell+geometry+workbook+answer+key', suggesting a phishing or credential harvesting attempt disguised as a document. The presence of multiple suspicious URLs further supports this assessment.

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://crophysi.ru/strik?utm_term=mcdougal+littell+geometry+workbook+answer+key
    • http://detonic-de.website/nekozepiwesuwuvitegui2efq.pdf
    • https://cdn-cms.f-static.net/uploads/4470228/normal_603725ac1ae08.pdf
    • https://cdn.sqhk.co/raxoxawupej/BhjgfC2/functional_fitness_training_exercises_for_beginners.pdf
    • http://jadogaxarabu.mygamesonline.org/24241348266.pdf
    • https://cdn-cms.f-static.net/uploads/4366309/normal_603f58a4b4c90.pdf
    • http://insurancecarusa.com/how_to_prove_parental_alienation_in_courtsy775.pdf
    • https://cdn.sqhk.co/gafisasiwu/G5gdEQ0/rodiledukimaximek.pdf
    • http://tk-pobeda.site/zixaloxuwusizawadid94d.pdf
    • https://static.s123-cdn-static.com/uploads/4389797/normal_5ff1366e6cc04.pdf
    • http://jaxagogilexet.sportsontheweb.net/what_is_the_literal_meaning_of_burn_the_midnight_oil.pdf
    • https://cdn-cms.f-static.net/uploads/4472484/normal_602075748b331.pdf
    • https://cdn.sqhk.co/sezivalaw/SjiRCxX/professional_photographer_near_me_cheap.pdf
    • https://cdn-cms.f-static.net/uploads/4454300/normal_6033fb8809dbb.pdf
    • http://jurojegame.getenjoyment.net/37548719697.pdf
    • https://cdn-cms.f-static.net/uploads/4380858/normal_604a4bc43b548.pdf
    • https://cdn-cms.f-static.net/uploads/4506200/normal_60147ced94cfa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zetikof.epizy.com/tasojesi.pdf
    • http://gazunobopa.epizy.com/18_month_language_skills.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_off0000f81a.bin
eff8175503a64f7e8c0434149f8f37b010e91656b3b7cb6e3e6a66ea0fbb3d06
pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 5544 bytes
font_01_sfnt_off00010af2.bin
0b145341087c01cba10a02505417fecf49403588497808b5c2d15ac43fb05012
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 11016 bytes
font_02_sfnt_off00013099.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x13099 4324 bytes