Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc252a48dd5ecd53…

MALICIOUS

PDF

82.7 KB Created: 2021-03-09 06:49:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 70f4e0d0d5da9bd31fc88a071bfc2109 SHA-1: b3e0bc5e990a0a9be4ad94dfb0265117e6b66126 SHA-256: fc252a48dd5ecd535df3a2fc643bf75e21ec1ab323f13e48f2c7b4474551ea52
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to lure users to malicious content.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://xajibur.ru/strik?utm_term=how+to+use+logitech+harmony+650+remote PDF link annotation
    • http://abanca-electronica.com/wafobikij13xs2.pdfIn PDF document text
    • https://resuzomesidi.weebly.com/uploads/1/3/4/7/134746605/535830.pdfIn PDF document text
    • http://shoop-ff.ru/92816904942cuh7w.pdfIn PDF document text
    • http://fakts.design/how_to_clean_a_farberware_coffee_potdrr1c.pdfIn PDF document text
    • http://puxelasuwo.22web.org/who_makes_the_most_reliable_lawn_tractor.pdfIn PDF document text
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/6809085.pdfIn PDF document text
    • https://taboloralo.weebly.com/uploads/1/3/2/7/132741194/f3daec30bc9f8.pdfIn PDF document text
    • http://autobuff.xyz/change_management_plan_template_example1kw20.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/b846aadd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_60224b93e19c4.pdfIn PDF document text
    • https://xivupofe.weebly.com/uploads/1/3/2/6/132681771/rujebomuvederus_fomes.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/waxosetunezudanaji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462046/normal_6003213c4568b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381094/normal_5fde216888421.pdfIn PDF document text
    • http://shoppermarket.online/gujuvediw8rth.pdfIn PDF document text
    • https://vunivejo.weebly.com/uploads/1/3/4/2/134266425/kofodomipukag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381980/normal_6042fc761fd14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mutelikatiseza.rf.gd/full_size_background_photos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff52c6c-a7c0-4412-baf1-6ef155a498dc/what_do_mayan_symbols_symbolize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054fe8b9-7553-405f-a1c1-fe3b4d61e39d/wafedofaxubeterun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/180494c5-3582-460e-9e9d-0476a56e9bbc/subway_map_nyc_2020.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_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 5788 bytes
SHA-256: e1384ad2f385bcb74839f472dc8b08142f0858ec7e717592a6e7aa2138046d81
font_01_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 10164 bytes
SHA-256: 9396a0949d850fe5d53f21c6daa90b06e0d2385e1a08bb1b767fa2694b0d2702

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