Malicious PDF — malware analysis report

Static analysis result for SHA-256 8489dc566ea94069…

MALICIOUS

PDF

80.0 KB Created: 2021-05-26 07:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 26b5cf50f46830cb6de114baefaf1c04 SHA-1: 2b0cf6d4741be6c48b77956cbf46c90f5f30c063 SHA-256: 8489dc566ea9406948d798343b292c9e7b3dbdab164382406adfd808e8d1c3e6
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which are hosted on disposable domains and redirect to malicious infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the embedded links suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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=what+every+first+grader+should+know In PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/876008.pdfIn PDF document text
    • https://zefemebok.weebly.com/uploads/1/3/0/7/130775969/3554405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_60683de71ef7f.pdfIn PDF document text
    • https://xidokuwu.weebly.com/uploads/1/3/1/4/131453793/a3262fc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451039/normal_5ffd4a5725578.pdfIn PDF document text
    • https://piwozasemoxusi.weebly.com/uploads/1/3/4/3/134378412/lofajez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_605fd57f0718c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_602651e8e64cd.pdfIn PDF document text
    • https://pudakivofuleges.weebly.com/uploads/1/3/4/8/134853743/2427089.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/5070d78f6b7e312.pdfIn PDF document text
    • https://gimalijuvilonur.weebly.com/uploads/1/3/4/6/134619020/wazatudofuduxuziwa.pdfIn PDF document text
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/refivokolivebi_wezodex_fuvunadajuza.pdfIn PDF document text
    • https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/lejowifojimipapes.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/jamonafota.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/3c084c6f0.pdfIn PDF document text
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/c97f1ddb29baa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_6067686c9ba12.pdfIn PDF document text
    • https://jelonuzekuxenu.weebly.com/uploads/1/3/2/8/132814084/repafobi.pdfIn PDF document text
    • https://fuzefiwojagolo.weebly.com/uploads/1/3/5/3/135308179/vitoxasiwek.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/3340906d-d6e6-4328-a0a1-0566ad203cb9/75059396212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76780662-11b3-483a-a3ce-2b2158886783/origami_gift_box_with_one_sheet_of_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce6aa4f3-8a05-4bbf-8b89-084f1acd8a0d/heat_and_glo_fireplace_remote_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e670235-9d4f-4fa6-948a-26449c75aadf/96104330143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58c2fc5-4638-461d-a084-af0219a103d2/norudiponemu.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_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 5500 bytes
SHA-256: 1e41379ca1fcb0a12de3ccaec8ef005117ee813937aee206531aad5bd5e9a1f3
font_01_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 11012 bytes
SHA-256: a9f0ed38c9de9be7f16adc8b33561704b127ec511c060c391a17e15a4a6db109

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