Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb90f81ed12f0f7…

MALICIOUS

PDF

78.6 KB Created: 2021-03-28 07:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5c18d0580ad4281f70ffdd75d2f30fd SHA-1: b3ae6038e80792221ce4c44e9e5b384c3d587dcf SHA-256: cfb90f81ed12f0f7599ca106c850e97e5ccaca4a45817a0be1c1539fd357e5cc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/award?keyword=5th+grade+math+trivia+questions+and+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4501212/normal_600b3ce22710a.pdf
    • https://cdn-cms.f-static.net/uploads/4370780/normal_601af6386a507.pdf
    • https://cdn-cms.f-static.net/uploads/4422622/normal_60274b0bde4b8.pdf
    • https://cdn-cms.f-static.net/uploads/4369763/normal_6047a7650696e.pdf
    • https://cdn-cms.f-static.net/uploads/4414848/normal_60317cce939ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c3470bdc-c25f-4244-8094-7234b8e1dec7/listado_de_cualidades_para_nios.pdf
    • https://uploads.strikinglycdn.com/files/7665d641-0adc-4a7b-8b1b-5c4ee0a53861/neopets_chemistry_for_beginners_guide.pdf
    • https://uploads.strikinglycdn.com/files/3ab1d73c-b0d0-4965-a4b9-ea97fa403b9a/tawisaderovebu.pdf
    • https://uploads.strikinglycdn.com/files/b0f2e84f-d2ef-4abb-9598-e2f3035d9286/lagelosokavovutogu.pdf
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_7ea334419c744c2880fc61cdb9626740.pdf?index=true
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_c5e7c5925a744445ad8b5ce15da89408.pdf?index=true
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_e42b61e38aa04e87a9658a33142c7104.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5a14c30a-17a8-41da-8be3-e876c0e5a03a/junior_graphic_design_jobs_near_me.pdf
    • https://uploads.strikinglycdn.com/files/9fad192f-6a3d-4384-9626-e6fe397635f7/boss_gt_1000_settings.pdf
    • http://jezirateba.rf.gd/sejarah_bilangan_bulat.pdf
    • http://xuwuxixu.rf.gd/autocad_lt_2014_free_trial_download.pdf
    • https://uploads.strikinglycdn.com/files/7291b04e-7cb6-4517-a9a3-c739ad219f4e/71913920419.pdf
    • https://uploads.strikinglycdn.com/files/3d0bc295-f64d-4d0f-93ca-bc37907f20e2/what_is_an_internal_control_in_auditing.pdf
    • http://zoxutudirufusoj.epizy.com/97405357923.pdf
    • https://uploads.strikinglycdn.com/files/0adf975b-a302-4f8a-a657-271bb634a9d4/can_u_eat_tacos_on_keto.pdf
    • https://uploads.strikinglycdn.com/files/dc9200ab-d726-4bd7-aada-7bc6107fde94/tom_clancy_games_2021.pdf
    • https://uploads.strikinglycdn.com/files/a96ea4d1-8ef0-4e09-b2f6-99a6c05e271c/ledawa.pdf
    • https://uploads.strikinglycdn.com/files/f13e28e4-c3ba-40e5-926b-c2a48d14a4c6/who_guidelines_for_baby_food.pdf
    • https://uploads.strikinglycdn.com/files/19f6fb50-2e46-402a-8fc0-56b8a6571b88/network_engineer_interview_questions_and_answers.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_off0000f411.bin
922bef734410133f6259707a077c599eb148db91405f42fcd2265c6cf11365fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 5732 bytes
font_01_sfnt_off0001077b.bin
600f372ffa9c6dd2793d04dce467f176caa9ab718aed30a06f7f953fa697761b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 10912 bytes

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