Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3aa90818098abda…

MALICIOUS

PDF

74.9 KB Created: 2021-04-29 05:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9d767ecd501088b0e220e23c2ab03eb9 SHA-1: eb152dfec11a744f714c9423ed1e2c165be52b60 SHA-256: e3aa90818098abdac0a9c3ede4c14a0cc73b73134f3e1078a1cd4ff0430464de
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be malformed, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=properties+of+exponents+quiz+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_6055f0dc0c13d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480387/normal_5fcf836c1652d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_60328ea1551b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448126/normal_6011946c6cadf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481510/normal_5fee2a9ac9923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420917/normal_5fe3bbb3501ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470843/normal_6052b85dee5e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383449/normal_5fcc5db70f2b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_5fd37975ca961.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/coniugazione_verbo_assistere_forma_attiva_e_passiva.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_7277eddabd024f8a84d3ce06afa5ae0c.pdf?index=trueIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_b163f6313e574f8cb8b91642e817750f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/alesis_drum_pad_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/sotukawurumarodikanituwod.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_34ba7a3bb65f4e74bd345688dd4d14a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legesiliv/kovaak_s_fps_aim_trainer_fortnite_free.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_a0840cab68174f1a9d4dc83830256235.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/vadenutano.pdfIn PDF document text
    • http://welusit.epizy.com/calcul_besoin_en_fond_de_roulement.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/documentum_webtop_developer_guide.pdfIn PDF document text
    • http://dokedajonanumi.rf.gd/us_open_draw_sheet_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/92772532868.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/kisom.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_14ae125c61b449e5bee31546dcb87143.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 5040 bytes
SHA-256: aa9f28994921c0ae210648f229b2d3fe13de88e4c910c4488977b81fd5a32e4d
font_01_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 10564 bytes
SHA-256: 9c07953727e7c74e1d337a45eba6b7b8a2937d5831c87a6bd4b84d5edb5844ae

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