Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66e790ec6c7a127…

MALICIOUS

PDF

75.0 KB Created: 2021-02-12 22:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85e22dd03bc5714a296a1316edf998c7 SHA-1: aa0fa36527c4307dc19f102c77ebca8967d02438 SHA-256: f66e790ec6c7a1275a6cad5ee87e1fefb26675f98ead18383efc2e7ca92d44bd
96 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains multiple embedded URLs, with the primary one being https://maypoin.ru/wix?keyword=new+preschool+teacher+introduction+letter+to+parents+sample, likely intended to redirect the user to a malicious site. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through social engineering, likely involving a malicious JavaScript payload within the PDF.

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://maypoin.ru/wix?keyword=new+preschool+teacher+introduction+letter+to+parents+sample
    • https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/8120523.pdf
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/7619951.pdf
    • http://covidcapsule.world/ping_pong_rules_bounce1stu6.pdf
    • https://baseparefawufif.weebly.com/uploads/1/3/1/4/131453046/2863ddac96e636.pdf
    • https://dipidedi.weebly.com/uploads/1/3/2/8/132815933/mosurawi_nosebudejivoket.pdf
    • https://gefivepuli.weebly.com/uploads/1/3/4/6/134620723/bcf6f1b28c.pdf
    • https://pomugulawes.weebly.com/uploads/1/3/0/8/130814995/b45b06cbabf.pdf
    • http://begemotiks.space/articulate_storyline_3_trialgm7t7.pdf
    • http://twirlini.com/rounded_corners_processingiuiyy.pdf
    • http://odebayitrafikhizmeti.com/220680496886xjx1.pdf
    • https://degijidugaf.weebly.com/uploads/1/3/4/8/134886203/kemosagefi-nibiwomukuzam-venepagu-mufexod.pdf
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/domorudewizizal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vofopinalog.epizy.com/lenokekokunoroxuzawel.pdf
    • https://s3.amazonaws.com/bamepofewalada/xamarin_forms_binding_mode_two_way.pdf
    • https://s3.amazonaws.com/kotodur/xawiweri.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_off0000e8ad.bin
f02d93a97f61572a3b49a061006f2104d30c4d03c70cdaa53a98f4a7ec6c2dbb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 5376 bytes
font_01_sfnt_off0000fae1.bin
dc096f005c7582696817fbfb6bc72680361319e108ee4127cd8eae02599fe3c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 10564 bytes