Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8160e81f4550cb8…

MALICIOUS

PDF

69.2 KB Created: 2021-03-05 10:18:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 864a001fc5b94d09de4c7eb9e0789312 SHA-1: e4cec07cbf1144db14b37a1c8e485e73822f7b04 SHA-256: e8160e81f4550cb8380714dd5a5b5fc899e0c6509f8fb3603060ca4deb4a3525
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=orbit+easy+dial+4+station+manuale+italiano PDF link annotation
    • https://cdn.sqhk.co/rodisukipi/ibCgegj/repelizoron.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/ieWKFgd/5164549765.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/dhaia96/falling_water_frank_lloyd_wright_interior.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/moxavomiwanak.pdfIn PDF document text
    • https://furogareb.weebly.com/uploads/1/3/1/3/131397930/a7a27.pdfIn PDF document text
    • https://zawamobapuve.weebly.com/uploads/1/3/5/3/135383520/zefatuxoge.pdfIn PDF document text
    • http://gopadaxin.mywebcommunity.org/dadurusamafetuwefet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_603808025f89b.pdfIn PDF document text
    • https://cdn.sqhk.co/segenoliz/3hfPYID/66951906464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460057/normal_5fe8038addd57.pdfIn PDF document text
    • https://cdn.sqhk.co/zavipudajose/gBXgjhf/97497585227.pdfIn PDF document text
    • https://rosififobagas.weebly.com/uploads/1/3/1/1/131164218/262695f941404eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464323/normal_5fe91539d05d1.pdfIn PDF document text
    • https://mixowobigasobu.weebly.com/uploads/1/3/1/1/131164278/lezepobirazelet.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/eaKAShj/58773223520.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/ibCicgj/lamaxan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_6c3b36299f0947159a3f886771e813ef.pdf?index=trueIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/the_claiming_of_sleeping_beauty_novel.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_2a62c360a6674150a20fff2caefd07bd.pdf?index=trueIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_645fb33a26b44090a7e03fd1693b05e2.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_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 5328 bytes
SHA-256: a2a023eac9c744b5ab976a1e80b9a47d5e901a2341704999b88fcaff80839833
font_01_sfnt_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 10588 bytes
SHA-256: b8829da26940a4f16ddb42ff74fa547d4d5f8db45fd48d9a254f0d3ceeb68c56

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