Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ec384966c85711…

MALICIOUS

PDF

82.6 KB Created: 2021-05-28 09:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f372588e7402a267d9d4362a6ae5d82 SHA-1: 2c3d249b4f2a744bed613d91f240a23c83579b9c SHA-256: 26ec384966c8571146e070ed5613fbb307ee8fec5ddb6ad7269c856531e7ce65
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The primary URL, https://jacksth.ru/strik, appears to be part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=google+scholar+h+index+calculator
    • https://cdn-cms.f-static.net/uploads/4472213/normal_60497e91dcdef.pdf
    • https://cdn-cms.f-static.net/uploads/4372719/normal_60418cccb05bc.pdf
    • https://static.s123-cdn-static-d.com/uploads/4406789/normal_60b00615a5026.pdf
    • https://cdn-cms.f-static.net/uploads/4365662/normal_604ac936cb2d6.pdf
    • https://cdn-cms.f-static.net/uploads/4473419/normal_60345f3ebb177.pdf
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/fokufajopaj_giloxanetonok.pdf
    • https://static.s123-cdn-static-d.com/uploads/4427528/normal_60aff5a0ae955.pdf
    • https://cdn-cms.f-static.net/uploads/4465538/normal_5fdb13c052348.pdf
    • https://cdn-cms.f-static.net/uploads/4487386/normal_601e981f716f9.pdf
    • https://cdn-cms.f-static.net/uploads/4378834/normal_60652df0ba046.pdf
    • https://static.s123-cdn-static.com/uploads/4371267/normal_5feb768ecdc88.pdf
    • https://static.s123-cdn-static.com/uploads/4470409/normal_5fdfabf83d50c.pdf
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/cb150f208.pdf
    • https://cdn-cms.f-static.net/uploads/4376359/normal_60135b4e149a5.pdf
    • https://cdn-cms.f-static.net/uploads/4490524/normal_60627b62da660.pdf
    • https://static.s123-cdn-static.com/uploads/4380890/normal_5ff96cc80db59.pdf
    • https://static.s123-cdn-static.com/uploads/4465388/normal_5fc8181e7f9a5.pdf
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/tesar.pdf
    • https://cdn-cms.f-static.net/uploads/4378852/normal_602f4116bdee6.pdf
    • https://cdn-cms.f-static.net/uploads/4387408/normal_606e6f1af0b28.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d4fe9b82-a6b4-4cae-ab56-e2351a42238a/asus_rog_hero_vi_manual.pdf
    • https://uploads.strikinglycdn.com/files/c1491087-2977-47b2-ad88-ad7b6f24d1a4/13657004881.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_off0001018a.bin
abaf3ec39e506ddf023f124ea68febc2eb9669de4bb6b69671d84af625f756b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 5300 bytes
font_01_sfnt_off00011393.bin
8a5080df2a203ac2fa1fe55250aa52965df088f97f49a2704ffd20759e44b7d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11393 12252 bytes

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