Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ffcc09a05deb76…

MALICIOUS

PDF

79.7 KB Created: 2021-05-01 08:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e4f054fc1b85b34319a942a6f2e4d946 SHA-1: 27f1e481cd8c50452e6246b36e0e160d017e6197 SHA-256: 63ffcc09a05deb76e10a72a69ec66c19531bffcc7bc9412218f96aa4cc629a36
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF document that contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The 'SE_CLICKFIX' heuristic indicates the document instructs the user to execute a command, likely to bypass macro restrictions and download a payload. The embedded URLs and the ClamAV detection further support its malicious nature, pointing towards a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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
  • 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/strik?utm_term=what+is+the+windows+shortcut+for+split+screen PDF link annotation
    • http://runmasten.online/law_of_torts_and_easement_meaning_in_urdug9ts9.pdfIn PDF document text
    • https://fopizute.weebly.com/uploads/1/3/4/3/134315067/8506e1ddac1a065.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/excel_2013_for_dummiestnfol.pdfIn PDF document text
    • https://bupebilonozopi.weebly.com/uploads/1/3/4/8/134861312/ebea3ecf4.pdfIn PDF document text
    • http://sungo1.space/new_bodo_video_full_hdbeyxb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_6056a46d39d5d.pdfIn PDF document text
    • http://italystore.pro/2018_chevrolet_spark_ls_manualjo62f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378857/normal_5fe6ccc07c78a.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/introduction_to_number_theory_textbook.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/56322282025ngrnu.pdfIn PDF document text
    • https://daxulidotuviwo.weebly.com/uploads/1/3/4/5/134597057/8718088.pdfIn PDF document text
    • https://tipiwaterexiw.weebly.com/uploads/1/3/3/9/133997214/kotipoleroxetut_vuponenifasubej_tedirukid_sesuke.pdfIn PDF document text
    • https://pokifuduxorimib.weebly.com/uploads/1/3/4/5/134501468/1429473.pdfIn PDF document text
    • https://jaluzirilunotu.weebly.com/uploads/1/3/2/6/132681851/0d83a57.pdfIn PDF document text
    • https://gavuwexis.weebly.com/uploads/1/3/4/7/134772394/6807884.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/nesuwabepux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_5855d76a64b946b3b95266241d434125.pdf?index=trueIn PDF document text
    • https://4d3f6715-1114-433d-a4b7-45a5e22e3858.filesusr.com/ugd/ce86b4_5157c69aa92d4955bcac2635e93c5f5a.pdf?index=trueIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_434f1fdd68854fef8d40d2a878f9c6f6.pdf?index=trueIn PDF document text
    • http://newemepakirid.myartsonline.com/samsung_top_load_washing_machine_error_code_ub.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_c1709c110651400ea054293280da5d37.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_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 5348 bytes
SHA-256: 374cff0edc16aca6b4aca9e79e0bf0e3fcf92b7bc0ab30624daa30906651530f
font_01_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 11664 bytes
SHA-256: 927ae9b7c3f32c6634772b84edc818146793e8a3224a949ad7c0de57b905ab2d