Malicious PDF — malware analysis report

Static analysis result for SHA-256 102439a9453fd5e0…

MALICIOUS

PDF

78.7 KB Created: 2021-03-26 00:05:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e43c77fc8b10aa52ba3d047e6baa975 SHA-1: aa6ce570ec0e64d68b60fd2043e4ec0d69e584bf SHA-256: 102439a9453fd5e05b0ea507e520d9fadf7fa0fc3010dd832fc45f8de61f0de3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as https://lozipotod.ru/aws?utm_term=6+core+values+of+social+work+explained, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/aws?utm_term=6+core+values+of+social+work+explained
    • http://omerkatanalp.com/1381085009hatph.pdf
    • https://cdn-cms.f-static.net/uploads/4394068/normal_605832ecefbcf.pdf
    • http://ttttrrrr.space/candy_run_5k_20200angg.pdf
    • https://cdn-cms.f-static.net/uploads/4387060/normal_6046b2030f693.pdf
    • http://fezelegafefuv.mywebcommunity.org/purizadovil.pdf
    • http://ziwusis.getenjoyment.net/mathematical_modelling_course.pdf
    • https://static.s123-cdn-static.com/uploads/4374978/normal_5fcd0bccd9367.pdf
    • https://cdn-cms.f-static.net/uploads/4410020/normal_604635bde553f.pdf
    • https://cdn-cms.f-static.net/uploads/4376870/normal_601e68bbc6ee5.pdf
    • http://nomenowunesazoz.scienceontheweb.net/68334381764.pdf
    • https://cdn-cms.f-static.net/uploads/4481280/normal_60119e3248729.pdf
    • https://cdn-cms.f-static.net/uploads/4450501/normal_6032f1f4860b4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zibemusisuvimal.rf.gd/baithungi_piya_bolero_me_dj_song.pdf
    • http://zenakezogutomu.onlinewebshop.net/artritis_reumatoide_seronegativa.pdf
    • http://kalotiwinilobiw.epizy.com/free_substitute_teacher_lesson_plan_template.pdf
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_d1a67cad86924353a804503bc36dd91f.pdf?index=true
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_f88bab2e4411472a8634799e32d27089.pdf?index=true
    • http://sagowef.rf.gd/wolitu.pdf
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_28996910d4c84cf19c5176c824cd9b38.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6cb.bin
474277bafc97b24614408e12241ab67e091c0970f896b9a8e2222a7949c35f5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 5296 bytes
font_01_sfnt_off0000f8e3.bin
87fb489b61d5463d97e2f040241b9734a3e03d69ff03a36bb9fdd7a06ba85ca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 10992 bytes
font_02_sfnt_off00011d94.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 4324 bytes

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