Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd1bbda68883c0f…

MALICIOUS

PDF

77.5 KB Created: 2021-03-27 23:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26bd8975a8f234c7184978ba58c38184 SHA-1: 9f5db2ba5cd63b466c7b86f6d26c13b30ba8761a SHA-256: 5fd1bbda68883c0fa63d0c1b8cd068c1b633abe8eea8726c2c45a2fdf61972e7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm, suggesting a phishing or SEO spam campaign. ClamAV detection and ML classification further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URIs indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/wix?keyword=vacuum+filtration+kit
    • http://bigpleasure.ru/u_verse_remote_not_turning_on_tv981od.pdf
    • https://wavujuwaliv.weebly.com/uploads/1/3/4/3/134375487/2355263.pdf
    • https://firupafawaxif.weebly.com/uploads/1/3/4/1/134109114/lixap.pdf
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/1508140.pdf
    • http://joritirumag.mypressonline.com/taxonomic_classification_of_bacteria.pdf
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/bd469.pdf
    • https://melesosinipedo.weebly.com/uploads/1/3/4/4/134475371/zesedufodud.pdf
    • http://purpless.vip/nesipamuzpnji9.pdf
    • https://kotevopokevunab.weebly.com/uploads/1/3/4/5/134590751/sapasabu-boruzuwupir-fobevipumef-tipeva.pdf
    • https://jakakatis.weebly.com/uploads/1/3/5/3/135323185/nikobelolov_bivatuxuf.pdf
    • http://bewizasosu.sportsontheweb.net/ken_copeland_healing_scriptures_youtube.pdf
    • https://cdn-cms.f-static.net/uploads/4369794/normal_604013eed023f.pdf
    • http://fallofelin.online/buborabonuzepijegenil1an2g.pdf
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/6007309.pdf
    • https://lidaleteso.weebly.com/uploads/1/3/4/0/134017218/widibuwa_temaw_jikosepipugu_binimirevu.pdf
    • http://zonokiwuwagupu.getenjoyment.net/mapa_biarritz.pdf
    • https://cdn-cms.f-static.net/uploads/4455178/normal_6021a4a6c465b.pdf
    • http://storezone.info/android_auto_update_apps_turn_off7ptmi.pdf
    • https://cdn-cms.f-static.net/uploads/4475853/normal_601d811a51cb2.pdf
    • https://begopafisofebe.weebly.com/uploads/1/3/3/9/133997970/03f8c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zodiripek.myartsonline.com/online_converter_to_word_ocr.pdf
    • http://najunanewoji.rf.gd/fogejixupepel.pdf
    • http://vufeligix.rf.gd/english_kannada_dictionary_application.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_off0000f3a5.bin
a7dfdbd3b39ee8dcbc988d900c12055a6cea01b54cb7038fdc1788e5cd5b5b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 4876 bytes
font_01_sfnt_off00010431.bin
721ecd3348a0911d7044273fae3194229ae81d54751c28cc463667b620d39736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 10724 bytes

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