Malicious PDF — malware analysis report

Static analysis result for SHA-256 a990b20e4d1747ed…

MALICIOUS

PDF

70.3 KB Created: 2021-02-21 04:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8623bb0ccba1925cc00a6d530875b450 SHA-1: eb1f0180c7a98b1687e82ec8264b598cf4ba635d SHA-256: a990b20e4d1747ed09b5193521186435bd7d2e52f102b46b04fb1b945c64f7ab
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to redirector infrastructure and link farms hosted on disposable domains, indicating a phishing or scam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/123?utm_term=audio-technica+at-lp60+fully+automatic+belt-drive+stereo+turntable+red In PDF document text
    • https://diborukokaw.weebly.com/uploads/1/3/0/8/130814192/vevenafugu-zezubozot-nopusujiw-kimesagovomun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451561/normal_5fedabb59e14c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457006/normal_5fc6cc4d7ccf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486751/normal_5fd276c9b0282.pdfIn PDF document text
    • https://kovajokuluvemu.weebly.com/uploads/1/3/5/3/135335912/nusurim-positirutibe-lumidu-wisibedanunab.pdfIn PDF document text
    • https://paboripiniw.weebly.com/uploads/1/3/0/7/130739049/duxeduwigut_papogudaripar_jawuzelibef_vaxevafopezix.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/pisopesare.pdfIn PDF document text
    • http://cetop.xyz/9133358390b0are.pdfIn PDF document text
    • http://doordash.fun/16214343388qqlek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390664/normal_5fc8859776cfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mufasiloxinak.epizy.com/genetic_polymorphism_review.pdfIn PDF document text
    • http://zinebozozapi.rf.gd/92958328919.pdfIn PDF document text
    • http://pefanusomi.epizy.com/libre_baskerville_font_family_free.pdfIn PDF document text
    • http://baxamudixilado.rf.gd/free_bootstrap_templates_themeforest.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_off0000d026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD026 6016 bytes
SHA-256: b0523119d440293dac318c868b4154a65493f1f3e2cddbcd5d91066455e8b5c1
font_01_sfnt_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 11584 bytes
SHA-256: 17f7279549bd28b77349ea221cdbf1c7c1358a83835bdf80346555fd8ad68385

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