Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffcfdcbcad71b94…

MALICIOUS

PDF

92.1 KB Created: 2021-02-25 21:18:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9c291895cfeb3a99ce9879c348f134ef SHA-1: ca6aaacc58a331e3e6aeee96e90c9ee1ef12b284 SHA-256: 8ffcfdcbcad71b94458d49b6624dc5ef080eb4824230d48d7cdb154e85271827
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The file contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to obscure the final destination. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/aws?utm_term=miss+peregrine%2527s+novels+in+order In PDF document text
    • https://xobojurum.weebly.com/uploads/1/3/4/5/134599739/3a36e3d5378a5b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_601831aadd5e3.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/cjjhcSe/1555971567.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/khihbFx/93627112730.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwozigef/dRyifjg/adorable_home_cat_food_time.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/5ce6a32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393883/normal_5fd3af2e8cf4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501503/normal_60343a2f289d7.pdfIn PDF document text
    • http://vemololuwejab.iblogger.org/torajitupinujawexop.pdfIn PDF document text
    • https://binemipo.weebly.com/uploads/1/3/0/8/130874238/mixubiwawi-miled-kozalan.pdfIn PDF document text
    • https://cdn.sqhk.co/xoradofexul/hj3Q9bj/vawugelufu.pdfIn PDF document text
    • https://jumirusuvowelu.weebly.com/uploads/1/3/4/6/134632856/fojunori.pdfIn PDF document text
    • https://jukaregexiw.weebly.com/uploads/1/3/2/8/132816195/sixado-lajajofog-suzediwu-setoxazak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_6019ac9a6d332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_5fd64b6fdad40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/dewujeteweremirizegumid.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/76254416775.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/43483982618.pdfIn PDF document text
    • http://duwimufowewis.epizy.com/vintage_decorative_frames_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/supplier_business_plan_template.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/40041914499.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/ohio_secretary_of_state_llc_annual_report.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_off00012d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D94 5016 bytes
SHA-256: 668c9eb0bd8ab172a5fad9f4169e784d3736a811aec2890902c890b07decad6a
font_01_sfnt_off00013ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED0 10420 bytes
SHA-256: 7b53cbf3ecd58d699906b76141714edb87713323308df634f1af01a2ee31e2de

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