Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a61e5780267807…

MALICIOUS

PDF

103.6 KB Created: 2021-03-12 02:44:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: c1b5af217c302b215784f3e0c238414d SHA-1: ceca267a6e1a02c6e6d9869ce8b9576c2aa92d05 SHA-256: f8a61e578026780743a948a9cb03fd3353a544e2526176f4dc49df74abe5f41e
244 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, with one link pointing to a known malicious redirector. This suggests the document is designed to lure users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://dafemum.ru/123?utm_term=flyff+gold+leveling+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465694/normal_6029e1e5754ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490752/normal_5fc85963e36a8.pdfIn PDF document text
    • http://13millions.store/disazujafidaraxen68k9z.pdfIn PDF document text
    • http://logekolumo.22web.org/84425539339.pdfIn PDF document text
    • https://dibapanapuro.weebly.com/uploads/1/3/0/7/130776085/7286354.pdfIn PDF document text
    • http://maska-respirator.com/vunajoxuzipalirijas8m.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/gufudoru.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/xifuxas.pdfIn PDF document text
    • http://namedaun.fun/baskerville_regular_font2slfq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392210/normal_5fd04b6f2bb41.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/621b3fdb-4788-4542-ae5f-9d1a1015a35a/88099861464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b66869f8-4898-4547-bcec-e470de9ec874/fe3_to_fe2_is_oxidation.pdfIn PDF document text
    • http://fojoxolizono.rf.gd/iphone_calendar_answer_cannot_be_sent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ad01f0f-caaa-46e8-a228-1c945a481b6a/nomixozimawuginomureka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0babde-ddfd-4ecc-9190-5ec1c646f4b7/old_testament_time_span.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e6d03ce-a299-43e0-8db8-2738bed1d896/40664718666.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_off0001592a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1592A 4708 bytes
SHA-256: 99c745c8a82ce25cbd0294334d1cba650811e0808267c73e7ece5fbe6e72786b
font_01_sfnt_off00016962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16962 11716 bytes
SHA-256: 21ca77d558b7cb8bf803aea7c74144a7418e59bed6dea78c18868a878eb8900d

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