Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a5c9f75ab22cdc…

MALICIOUS

PDF

89.0 KB Created: 2021-03-20 05:12:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 786667fa66d34cf12bbe2a60d24af5e4 SHA-1: 059904661a1801a47fe1d19007e047ba8b87f79a SHA-256: 88a5c9f75ab22cdc7ffc28c14f9086066f1281c85c864f64907c1007b22db41f
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though truncated, includes keywords like 'blood on the ice' and metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs. The presence of external URIs indicates an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wix?keyword=blood+on+the+ice
    • http://bikokobolo.sportsontheweb.net/grief_and_loss_cycle.pdf
    • http://jepisafidezegun.scienceontheweb.net/95940990423.pdf
    • https://cdn-cms.f-static.net/uploads/4374703/normal_6018bbe128f75.pdf
    • https://rutebesutev.weebly.com/uploads/1/3/4/1/134131531/fazijaxidorokezodume.pdf
    • https://static.s123-cdn-static.com/uploads/4446286/normal_6001be7919df9.pdf
    • http://birebap.scienceontheweb.net/votugo.pdf
    • https://cdn-cms.f-static.net/uploads/4381287/normal_6043baf9d06a1.pdf
    • https://cdn-cms.f-static.net/uploads/4402932/normal_5fd76ca0f3989.pdf
    • http://wokulorumal.iblogger.org/formal_letter_writing_english_grammar.pdf
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/e90bd0c70c.pdf
    • https://static.s123-cdn-static.com/uploads/4497131/normal_5ff914f7a5059.pdf
    • http://wilugobosisur.22web.org/ken_blanchard_lead_like_jesus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lutuxulumoxi.rf.gd/universal_vpn_app_apk.pdf
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_18c0b549ff4049eea12c411c3d76a91a.pdf?index=true
    • http://nizofikunatafu.atwebpages.com/bose_321_series_iii.pdf
    • https://uploads.strikinglycdn.com/files/2126b0ce-311c-4278-8d90-7d35ef667088/sports_illustrated_swimsuit_2020_poster.pdf
    • http://tudixuzaw.onlinewebshop.net/penedi.pdf
    • https://uploads.strikinglycdn.com/files/e1924ff1-9d23-4677-88ab-38c765af58e4/best_books_on_financial_modelling_using_excel.pdf
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_63a2625c87a54d72ac5fb873a3ad7c82.pdf?index=true
    • https://uploads.strikinglycdn.com/files/31bea0be-ee9c-4542-98e0-1695e400e6e2/why_is_my_dog_always_thirsty_and_peeing.pdf
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_4e013e0d901a4c72968ffd2cab2f16e5.pdf?index=true
    • 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_off0001230e.bin
0852f5e1b3178d3a2c3bd979d2661274de77aeaac64bf101d52732905cb23784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 4592 bytes
font_01_sfnt_off000132ac.bin
84dfd1c89a48bd7969c22b72e260da3d1778460e92b6c86695f154980c935cd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132AC 10680 bytes

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