Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ec0bd3bd905d49…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 17:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d1262c4ff4b226d61ed627c22d8cd44f SHA-1: e061990f50e62927942932f8659eea91d43ed1a7 SHA-256: b3ec0bd3bd905d4928ed82c0e0713324fcc4172dce2f7375bbbd3c65e4804810
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body appears to be obfuscated or corrupted, but the presence of links and the heuristic firings point to a redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=garrett+ace+250+user+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_6044ccb1bfc03.pdfIn PDF document text
    • http://instapresent.site/nomawaxit7bhs.pdfIn PDF document text
    • http://dutagogijifu.iblogger.org/tajevesojuluk.pdfIn PDF document text
    • http://kodamup.22web.org/dishonored_2_guide_faq.pdfIn PDF document text
    • http://citrus-fruit.space/41443603322s3vw3.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/g3ckihA/nefobekavomemexokelumog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_601b377b0cd14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_5fe8111e22cde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_603cff3cba841.pdfIn PDF document text
    • https://cdn.sqhk.co/wulozonixuf/gjjQdEo/world_chef_day_photos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_6024052becf57.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/9cf699b8-d1f3-4b6f-ade7-889eea233ea6/monarch_lathe_manual.pdfIn PDF document text
    • http://vogafaxusa.epizy.com/4882301320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa7d197a-c0a6-4d0d-8fab-44bd66e1bc48/virebap.pdfIn PDF document text
    • http://gudavipupax.rf.gd/72969753186.pdfIn PDF document text
    • http://dujofaxuro.rf.gd/status_asthmaticus_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aedb3cb-2e15-4150-8cbb-d29c47f7f8f5/xetole.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_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 5504 bytes
SHA-256: 6e5da444587f918e784e42876b2e1c4f4be67b7bdbf3c47b1211fc31285714fa
font_01_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 11016 bytes
SHA-256: 0d06fde5449e7a3021bccde54de75a202a9a1416c6b31b9f14be52f0c8bec3d2

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