Malicious PDF — malware analysis report

Static analysis result for SHA-256 db82185cf88b7533…

MALICIOUS

PDF

66.3 KB Created: 2021-04-01 13:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a7f9937dfc85bb55c9ff9753d7228d13 SHA-1: 7ec861bb7036b4a1cca536e2109dc2152ee6ff1b SHA-256: db82185cf88b7533b60ab2cf816bc89c0af5a31964ae542bc61aafbb220ff2d9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many URLs indicate a pattern of directing users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are strong indicators of malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/wix?keyword=reflection+and+refraction+worksheet+5th+grade PDF link annotation
    • https://togajakuro.weebly.com/uploads/1/3/1/4/131409127/6858317af2.pdfIn PDF document text
    • https://jomupalekiloja.weebly.com/uploads/1/3/4/3/134310494/4667089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424646/normal_6003968872e96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_600df98a123e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446923/normal_5fd260cead1f5.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/texowidigefebalixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_602af77620c6b.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/8123418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_6020a2c57bc4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_4e08219439cb49d383efdf37b81fd4dd.pdf?index=trueIn PDF document text
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_e2f3b075a4a7443396a60abb36555cd7.pdf?index=trueIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_55a37b48c0ca4a39aa957be647dfb02e.pdf?index=trueIn PDF document text
    • http://ragomoxos.rf.gd/gentleman_jack_sheet_music_violin.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_59353b287ba14be9a06680dd797961ef.pdf?index=trueIn PDF document text
    • http://wubalele.rf.gd/ammyy_admin_3._5.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_761618ea5b6e4f7d86c922f73d6f69e6.pdf?index=trueIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_2ee0d2d9491c43fe9076df3cbea56609.pdf?index=trueIn 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_off0000c662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC662 5572 bytes
SHA-256: 412a39c2db43c0180179fe44bd10b984dc10660f9223750728ace8ba058c4e0c
font_01_sfnt_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 10076 bytes
SHA-256: 99cd946071891e223502e13c1be0749b2ff491f04435feee66832e97c541695f

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