Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d33cb170cd5ef0…

MALICIOUS

PDF

83.7 KB Created: 2021-04-28 11:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bde19ae93b0b5a9b7fd953e66c4f9345 SHA-1: da734c3ef9068a020726fbc70ff4a705cb2d42d8 SHA-256: a4d33cb170cd5ef0a9a24a0e4b7bf05f71da16dc86711bbd99db697a859a68c3
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://dafemum.ru/strik?utm_term=sky+remote+code+for+sony+bravia+kdl40v4000 PDF link annotation
    • http://suwetobolubujub.getenjoyment.net/6395815460.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/what_is_the_5_love_languages_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_601704cac40e8.pdfIn PDF document text
    • http://gugolufixa.mywebcommunity.org/antecedent_behavior_consequence_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428334/normal_604ebb79f135a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_6013e7ba32f2d.pdfIn PDF document text
    • http://gonifarej.mywebcommunity.org/accounting_manager_resume.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372384/normal_5fe36b7992f8a.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/37689303392.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_698029fa35e3456e8597b4cbcbd95042.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_5caac8989f0942b5b47c16a43d072e20.pdf?index=trueIn PDF document text
    • http://novogizeboje.myartsonline.com/61673245012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb332157-3f3f-4d81-9c45-5e859db42a5e/sorefaxalidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e597de4-3966-44c8-933a-f15e50e315d9/11649299022.pdfIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_635fb053b83b411cbbdd952c27594e09.pdf?index=trueIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_60c88a3c64184a319be3afc888df7645.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_0ec96e3109214d229a9c1a1794a334d5.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_8a96f9fd37374687a019c84e47622a22.pdf?index=trueIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_6f1010e650034d2db73016e5037c8936.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_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 5868 bytes
SHA-256: 96b5df524fda98524891058c7d01972a93b9d785dddc28fc2bc4e5f6cb64f913
font_01_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 11428 bytes
SHA-256: a78fc8facebd2468481a71dea20b94bfb33baa0d822dd335406a9d666e9f2109

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