Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc111c729d73f803…

MALICIOUS

PDF

80.7 KB Created: 2021-01-26 18:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c2dbaf2aee09baead6d1723a18443983 SHA-1: 46b6005b78e4978bc934feb3b909a252e5634cf2 SHA-256: bc111c729d73f80346d7bb16607e2faec742a12cbea427493bf3cae07368b409
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified by both ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it may have been generated programmatically. The presence of an external URI heuristic firing further supports the malicious intent of directing users to a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/123?utm_term=i+love+you+3000+iron+man PDF link annotation
    • http://kelnoteres.xyz/face_mask_diy_easyx5pba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369651/normal_5fdde687d886c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492253/normal_5ffd1ed0dc1e5.pdfIn PDF document text
    • http://lifegirls.site/monster_jam_steel_titans_ps4_pricex0n0k.pdfIn PDF document text
    • http://socialwave.me/dotovemotudumidirogimuq0y6l.pdfIn PDF document text
    • http://1ux.site/volowu14o71.pdfIn PDF document text
    • http://dayzcommunity.info/defense_dead_apkw1dm0.pdfIn PDF document text
    • http://autoport76.online/vekipunaxiwabuserilip70va.pdfIn PDF document text
    • http://uuuuull.space/kutobuwojogikeborcna3w.pdfIn PDF document text
    • http://all-system7.xyz/ping_pong_ball_air_target975le.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464530/normal_5fe41a75e1e65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366319/normal_5fe38d9748bca.pdfIn PDF document text
    • http://constructionhouse.info/nexubobatepw5buu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_600ba127c1666.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407306/normal_5ffe6b9846523.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_6001e2525c2e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wikidupuzok.epizy.com/chip_formation_cancellous_bone.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/guwurekokag.pdfIn PDF document text
    • http://kebojupevanivi.rf.gd/lufeb.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/asco_cap_her2_testing_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/answer_key_class_10_maths_2019.pdfIn PDF document text
    • http://zumijuxuv.epizy.com/90952796106.pdfIn PDF document text
    • http://jupuzagap.rf.gd/86827924714.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 4860 bytes
SHA-256: 39cde6d91f7a24eba4befc43411a3d3f466881969a26862cb9e47bd1aaa4fa05
font_01_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 10968 bytes
SHA-256: fcd32d8ea7eaf52a70a0044177c5bbae8864665792cf348211bcab06b95ceee3
font_02_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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