Malicious PDF — malware analysis report

Static analysis result for SHA-256 285c8647739b089b…

MALICIOUS

PDF

66.6 KB Created: 2021-03-19 15:28:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a81d18cccf4fe8705e79eec53c28319 SHA-1: 4e4558ab2c3431dc6871b5da1921ba69b761544f SHA-256: 285c8647739b089b8bb995c454d1994b934748174e987a7a1ba9f9272243e80b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous external links to other PDF documents hosted on disposable domains. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or malware distribution, rather than providing any meaningful document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8416

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/aws?utm_term=plt+set+title+size
    • https://cdn.sqhk.co/wisewuguv/phdgfoQ/domino_effect_great_examples.pdf
    • https://static.s123-cdn-static.com/uploads/4418184/normal_6001964071e0f.pdf
    • http://vaxenovutejuzid.sportsontheweb.net/diagnostico_comunitario_en_salud.pdf
    • https://cdn-cms.f-static.net/uploads/4413968/normal_602db010e4a13.pdf
    • https://cdn.sqhk.co/wuvukidovime/gnEm92E/airplane_and_paper_with_pencil_emoji.pdf
    • https://zekisotirateme.weebly.com/uploads/1/3/4/3/134368555/vuxob.pdf
    • http://kopogaxepaku.sportsontheweb.net/96394514515.pdf
    • https://mugapasuxow.weebly.com/uploads/1/3/1/4/131437627/660302.pdf
    • http://pazadixokumox.sportsontheweb.net/how_to_adjust_needle_on_singer_sewing_machine.pdf
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/sabutozisawadu.pdf
    • https://cdn-cms.f-static.net/uploads/4495550/normal_5fe9c78f22a59.pdf
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/jesilefolevafedi.pdf
    • https://cdn.sqhk.co/fejavegiwo/jbBYXgc/50880690022.pdf
    • http://wimebenese.getenjoyment.net/butigakaza.pdf
    • http://xafesuvorolivig.scienceontheweb.net/faleterofakuzebunupemejo.pdf
    • http://naturelofo.mypressonline.com/vekinuwogajenu.pdf
    • https://xofiguguja.weebly.com/uploads/1/3/2/7/132710561/4118886.pdf
    • https://cdn.sqhk.co/luwonowuwig/gehaEcc/sumizadojiw.pdf
    • http://vudasuti.mygamesonline.org/cbse_maths_textbook_for_class_5.pdf
    • http://zonizubiro.getenjoyment.net/foxagafabinedofiv.pdf
    • https://cdn.sqhk.co/zagekexeroze/hBIakLR/tribal_wars_us_world_50.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_57bab08d1f274d61a66d9b364a81f40b.pdf?index=true
    • https://16b16ea1-1eac-4681-bfdb-39d0b7b0c60a.filesusr.com/ugd/d6b497_f503c9b1a08d474fb53bcee70d09193c.pdf?index=true
    • https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_b556229c76e942f9b4cff81e31842fa0.pdf?index=true
    • http://xuvekixofeku.onlinewebshop.net/what_is_credit_memo_post.pdf
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_a2e61dabe930495dbc43a10d40e95e67.pdf?index=true
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_0c3124a253a44237902de542148dc9c9.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12d.bin
daaadb1993cd5f01703a599844033e25f1f070e795ccb19f5ced413a82fdf28a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 4424 bytes

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