Malicious PDF — malware analysis report

Static analysis result for SHA-256 37499d9b7cb85717…

MALICIOUS

PDF

77.2 KB Created: 2021-05-27 20:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ac2013a3f3ee5dece23f9990e3a85b82 SHA-1: ed3e677863f51336a516c52afe62301a5c777c07 SHA-256: 37499d9b7cb85717f1b270f52dd5a55b5162d53c7079fb6c05bcbdfb2d94e5b4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. One prominent URL, 'https://resalured.ru/strik?utm_term=setup+charter.net+email+on+iphone', indicates a lure related to email setup, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and numerous external links strongly suggest it's part of a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://resalured.ru/strik?utm_term=setup+charter.net+email+on+iphone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451766/normal_601e7b36828b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457847/normal_606e31e84331c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_60511aab885d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455185/normal_602a33961c1f8.pdfIn PDF document text
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/6118572.pdfIn PDF document text
    • https://kadenuwu.weebly.com/uploads/1/3/4/6/134674874/ruwowupex_tagokuz_xujewige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482858/normal_6016d30d596dc.pdfIn PDF document text
    • https://korubati.weebly.com/uploads/1/3/7/5/137515423/7529583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491439/normal_606276a774a48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_60382f3242b2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5fe6c849f1ad9.pdfIn PDF document text
    • https://linusakeziri.weebly.com/uploads/1/3/4/7/134747074/9f09176d3c325.pdfIn PDF document text
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/bimeje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469847/normal_5ffd6e486f3cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484618/normal_5ff76ce2aabb3.pdfIn PDF document text
    • https://murozukuzofapu.weebly.com/uploads/1/3/4/7/134716639/juketotanimix-velijuvopu-vaboxivubivu-puwexejajij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450628/normal_5fcb2c0ea968d.pdfIn PDF document text
    • https://rejezulibege.weebly.com/uploads/1/3/4/0/134018585/xironivofosisif_jokew_bifosozokuxeli.pdfIn PDF document text
    • https://sokonova.weebly.com/uploads/1/3/4/3/134322069/nofikez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 5132 bytes
SHA-256: d58a5af29cfe109d429248563ab69ef8671e332ad52257e8b0a868e618279f34
font_01_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 11028 bytes
SHA-256: 18fd32f3c6f308d47fd949af91e4887e09c066d3597fd16bc6a0144f58072c6e

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