Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4e618efd7e9f66…

MALICIOUS

PDF

119.1 KB Created: 2020-11-12 22:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 237f9d83db78ade6a36b29d9b35ae67c SHA-1: 92943753beda59647f8f889fc1a2aaf9283c2bc6 SHA-256: 0e4e618efd7e9f6642480963305609375162e612624b1f3455232af22e7eff03
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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://ggtraff.ru/123?utm_term=us+history+eoc+review+packet+2019+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f8749ae62c9e.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/7482988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446642/normal_5fa54d0fd7c82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5f89f7de8a108.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/watixidiman.pdfIn PDF document text
    • https://resumasilazivo.weebly.com/uploads/1/3/4/5/134509929/tatasexaruwujonuwig.pdfIn PDF document text
    • https://pisekubil.weebly.com/uploads/1/3/4/3/134322001/e7ea05c.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/a086f05e-e961-43ea-b733-396fc1cea574/zujoxopexutalejixagop.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/antenna_booster_amplifier_for_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7da6927-f919-4a85-bc32-9f0cb52f5fbb/unit_2_study_guide_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/basalenozis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fda25fd-de3d-4e66-bc20-330ea7f49615/workout_posters_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e0ea1c-6b05-4cd1-b1d2-acfed216846d/58161197954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2f454f-d1dc-408b-bc52-ac000c9d2c2c/linde_forklift_manual_parts.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_off0001927f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1927F 5780 bytes
SHA-256: 81b72746d1b67d37c5b8bea8fec2a3d081e677632c94b6ef718cd26f68543f9b
font_01_sfnt_off0001a64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A64B 12332 bytes
SHA-256: 0bfd6f82c0cf201909ced36edbdab9bd39f3a934c572b44c5b19cf65a8ac8c96

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