Malicious PDF — malware analysis report

Static analysis result for SHA-256 65038b440da142b4…

MALICIOUS

PDF

67.5 KB Created: 2021-03-30 02:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c0f13a0a8c7c3af10c39df3c8ab00a3d SHA-1: 3547a20533624ffabc008fa49765453ab79fd8e7 SHA-256: 65038b440da142b483e51a451f5f245fbf804ecbc01ffc5e12f1f9f2cf3c59d5
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to obfuscate malicious links and potentially exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=baldur%2527s+gate+strategy+guide+pdf+download PDF link annotation
    • https://cdn.sqhk.co/xoxujakosepa/jajikic/football_star_academy_canberra.pdfIn PDF document text
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/7386574.pdfIn PDF document text
    • https://bepixumute.weebly.com/uploads/1/3/5/3/135302933/xegewedazu-bejivo-devizax-vebukijisevonoj.pdfIn PDF document text
    • https://baziwiruxufuwav.weebly.com/uploads/1/3/1/4/131482892/e6a9b923ddd3b5.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/jbwUfhd/jisokugagajegi.pdfIn PDF document text
    • https://cdn.sqhk.co/nigudovowa/hbhbhnV/mutaburufim.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/2qQoCxi/mini_golf_carroll_county_md.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/jgdjaJq/sawiranozukefufoje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_93ba8d6a94064b299f80f66c12ca85ae.pdf?index=trueIn PDF document text
    • http://rusakarazixano.epizy.com/business_email_sentences.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/kumejexejijipev.pdfIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_8042bd703d3747d9889dfa289a063372.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a5145f-74f5-49e5-9899-298a86aab6e2/the_wrath_and_the_dawn_series.pdfIn PDF document text
    • http://lasarogime.rf.gd/98319103488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16f4df2-7418-48fe-a58a-dbcf3253dc25/ielts_cambridge_9_listening_test_4_answers.pdfIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_28ae6fa39bcc4258bb92cff519fc3e5e.pdf?index=trueIn PDF document text
    • http://wajodojizofe.epizy.com/womatodototasomutunureniv.pdfIn PDF document text
    • http://jawevobafepen.epizy.com/vccv_worksheets_4th_grade.pdfIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_b3dc8324c0844543b41ab9aedd7403da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajixe/40184427931.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_off0000c93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93B 5484 bytes
SHA-256: dfacfa07f5b1d4233f64584fc9e6d89f039ed585ddb7d1834df2f706dcddee8b
font_01_sfnt_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 10700 bytes
SHA-256: 2e8c6f2f704907e3243b5d2d9eed3ee9b2249ac678932833ca2140597e9125f6