Malicious PDF — malware analysis report

Static analysis result for SHA-256 685e1693a330fc06…

MALICIOUS

PDF

136.8 KB Created: 2021-03-23 08:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c124c891fa421df610c866860da5bf03 SHA-1: de3667f43b5d81887b08a9255bb350d63f9c986b SHA-256: 685e1693a330fc0685bf63985a4549ed07ec6d4e88f6cac61100af08d27ee213
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to be related to a worksheet, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/wix?keyword=returning+soldiers+by+web+dubois+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4445320/normal_6046431c6fd7f.pdf
    • https://cdn-cms.f-static.net/uploads/4459623/normal_5fd898a11e6c0.pdf
    • https://static.s123-cdn-static.com/uploads/4366341/normal_600831a10ac73.pdf
    • https://cdn-cms.f-static.net/uploads/4446490/normal_603351a0712d6.pdf
    • https://cdn.sqhk.co/guvelebul/6Jric6l/othello_game_rules.pdf
    • http://hempmap.ru/jurnal_terapi_bronkopneumonia_pada_anaka475k.pdf
    • http://microbladingcertificationdfw.org/noweludepovabujugizewx43x5.pdf
    • https://cdn.sqhk.co/kubepugemaki/gfjeGid/parents_kit_app_download.pdf
    • https://cdn.sqhk.co/terodekijur/jiDjghc/51231626159.pdf
    • https://cdn-cms.f-static.net/uploads/4412387/normal_5fea19809702b.pdf
    • https://cdn.sqhk.co/jarixizotib/d4pN9aO/gepixaluguzesisos.pdf
    • https://cdn-cms.f-static.net/uploads/4475563/normal_60544b4ba2057.pdf
    • http://lisolu.org/zakoxajeposeziwabibhtd4.pdf
    • https://cdn.sqhk.co/zivuronufepu/MEiiTgi/ninja_puzzle_game.pdf
    • https://cdn-cms.f-static.net/uploads/4502178/normal_6051963adfe62.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fotojipifuzitul/57661706654.pdf
    • https://s3.amazonaws.com/paropabaru/94099380376.pdf
    • https://uploads.strikinglycdn.com/files/011c5255-64e6-4a07-a5ee-21133c3a0701/28300964861.pdf
    • https://s3.amazonaws.com/xidulumexi/paliwusiniji.pdf
    • https://uploads.strikinglycdn.com/files/96f68e5a-6192-43f3-904f-b4a3a1b685fe/lawoko.pdf
    • https://uploads.strikinglycdn.com/files/6f028af5-b9e0-4308-93c9-ebd7c1dd0dee/where_can_i_buy_the_amory_wars_comics.pdf
    • https://s3.amazonaws.com/luramamelolem/24960418101.pdf
    • https://uploads.strikinglycdn.com/files/a2d05c93-1310-4e07-ab85-0a87ceeeb15e/matlab_programming_language_download.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_off0001db04.bin
c1004501ab6506b2f43a91971b1c8db9e2564a0c70e67df46dae06fc8a8d25ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB04 5492 bytes
font_01_sfnt_off0001edbf.bin
b97c196b51397c25bf5f20616ad93a3ba5dd885482bde48a06020ea438d9fee1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDBF 11088 bytes