Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03048527a555810…

MALICIOUS

PDF

79.3 KB Created: 2021-03-13 20:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7118d262a46b9c907b4db3adbff16b45 SHA-1: 820b8b7d1bf0b0ea068b33b9d0105ee06d1417c3 SHA-256: d03048527a55581045310c4346a31d66d6586dad30e97af40a9604268b03f504
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to PDF files, suggesting a link farm designed to attract traffic or distribute malicious content. The primary malicious URL identified is jumiwimov.ru, which is likely used to host a phishing page or download a second-stage payload. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/wix?keyword=samsung+multiroom+app+for+pc
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/4d3e8ec4.pdf
    • https://legalages.weebly.com/uploads/1/3/4/4/134442537/8df6f789f0adf.pdf
    • https://monokuzofo.weebly.com/uploads/1/3/2/7/132741222/sopefopujiwibud.pdf
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/e62784.pdf
    • https://cdn-cms.f-static.net/uploads/4485578/normal_602fa8aa1587a.pdf
    • https://cdn-cms.f-static.net/uploads/4417531/normal_6022bb75a94ca.pdf
    • https://cdn-cms.f-static.net/uploads/4463554/normal_60160e6d2280b.pdf
    • http://fejekadiwoxobiz.getenjoyment.net/what_the_meaning_of_admission_rate.pdf
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/marimiruwu.pdf
    • https://cdn-cms.f-static.net/uploads/4366308/normal_602867b687382.pdf
    • https://gukamixi.weebly.com/uploads/1/3/4/0/134042495/gemapatelitibun_zolozifavaxolis_kerifixadibu.pdf
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/vozit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_c41ef2d8e4284d5a810afec134540c8a.pdf?index=true
    • http://vulopekusape.atwebpages.com/easyjet_brand_guidelines.pdf
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_d206a7268304460091ee799ddeb9ca66.pdf?index=true
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_892345bee15d4b83b3d7066b7bfd81ce.pdf?index=true
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_622eaecd428b40a7865a9e24e5789078.pdf?index=true
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_e9c082120a07447f80583fd7e9c20dc2.pdf?index=true
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_9d05dd97b73c49b9a04949ab5b913297.pdf?index=true
    • http://tipokeviti.atwebpages.com/the_apache_ignite_book_download.pdf
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_0006e0952b274766b804c946a985bc09.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f721.bin
67e1881e27f67f0c0d48472fbf8f74ac2670ebde90b586cd4ff01f2217aaeda0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 5436 bytes
font_01_sfnt_off0001098c.bin
ec308e55082ff65798506980eb34f8f46c47ec4a9a833b6ff3bf983cb63bf527		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 11292 bytes

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