Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f97d166109be60e…

MALICIOUS

PDF

76.4 KB Created: 2021-05-24 14:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 65d557cef57c69e9193a7c5577b95883 SHA-1: 217ba14e11ab4de42d10773d8a2e7ec0f322a2a2 SHA-256: 8f97d166109be60e23ad311ef4cfc96b261a0ef8fd65e1644915be6348852809
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://jottigo.ru/strik?utm_term=full+stringer+real+estate', is directly associated with the document's content, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=full+stringer+real+estate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403117/normal_601bc235eb10d.pdfIn PDF document text
    • https://tevunuxewime.weebly.com/uploads/1/3/1/4/131452804/32a67e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392868/normal_5fff6e3b3f295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419640/normal_605d75ba212d1.pdfIn PDF document text
    • https://jujokubibafa.weebly.com/uploads/1/3/4/6/134621517/cc6aa2a59bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_603011cf41f82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_601f80faa92a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_606812e85587c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4ad914-f3cf-4b75-8a12-53f4bfe41d40/83732648053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/612ea203-7555-4c33-bc87-ef1315b565af/wafatalugezunafoju.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/pixerivifoxajimuxod.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/wpf_treeview_hierarchicaldatatemplate_recursive.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/wibukimalovebabe.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/bioscope_video_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/54369510644.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/molarity_by_dilution_chemistry_if8766_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/kadojakolafijapagot.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/liduripekutiburakimoxal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9894b66-deda-48d1-a099-e1b40b2d4f21/klein_tools_ncvt-2_dual_range_non-contact_voltage.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/english_for_beginners_online.pdfIn 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_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 4808 bytes
SHA-256: e25a445fba8346452be98c9ae8c284517506767dbc4e4f6c6e746bfc6cae1352
font_01_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 10456 bytes
SHA-256: 50d18ed9b08150b5c564f0e4fcdf7fe9352e6ec563757d9a6136ef6079a92eae

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