Malicious PDF — malware analysis report

Static analysis result for SHA-256 280533322633ef36…

MALICIOUS

PDF

69.1 KB Created: 2021-04-04 21:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cebef69216c7642e43bb526a7801218d SHA-1: 8860f7b29a62947a70188063a97596ec24d7d24e SHA-256: 280533322633ef36d33abc58b80f45aaa974a54b15cbe080239a02cf6975993f
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to product clamps, likely to entice clicks on the malicious URLs. The presence of numerous links on disposable hosting further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://yafferge.ru/123?utm_term=dewalt+plunge+saw+guide+rail+clamps In PDF document text
    • http://bepelisufozasep.mywebcommunity.org/manual_de_primeros_auxilios_para_nios_de_preescolar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_603b954b913cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419225/normal_5fff78b5d9d78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_60285aebe8503.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/the_vampire_diaries_cast_in_the_originals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_604eeab026eb1.pdfIn PDF document text
    • http://kopaburak.sportsontheweb.net/aritmetik_ve_geometrik_diziler.pdfIn PDF document text
    • https://gofutetawavoror.weebly.com/uploads/1/3/0/8/130874623/1fda3fa14.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/celtic_influence_on_english_language.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487622/normal_5fcc70363a24f.pdfIn PDF document text
    • https://mewirolubeb.weebly.com/uploads/1/3/4/4/134446630/1446945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415322/normal_5fe207a395377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5fd170d35902a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapibudajemuk.atwebpages.com/amazon_echo_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff70fa8f-3c57-4ac4-af3e-b69518d1c859/john_deere_lawn_mower_parts_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d0d3d7-993c-4a20-9ae5-93a520805690/the_devil_is_a_part_timer_light_novel_vs_manga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95425075-506b-4a0f-8437-c66c4a53db3a/63894280774.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD10 5484 bytes
SHA-256: 644b70d232b2b8c854e55a337f35e724787d2a433a1a86ea188f9d15395be63d
font_01_sfnt_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 11288 bytes
SHA-256: ed23d0949e2c8da2d34004c1d6f8fc01e17e49791cfdf80da637303ab6177b7f

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