Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e394e33cee6ab98…

MALICIOUS

PDF

87.2 KB Created: 2021-04-29 16:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c1eb150ce2532152fa255019942bf207 SHA-1: 9cb6eca80ebe48b497a666cf5f76bd82b8a8af6e SHA-256: 5e394e33cee6ab982475cbbec5ef0a0746e3a5ed619f097c75f4f6f73e1b59e0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to other PDF documents, likely for SEO manipulation or to distribute further malicious content. The presence of multiple disposable hosting domains and UTM parameters in the URLs suggests a coordinated effort to obscure the true destination or purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/strik?utm_term=essential+words+for+the+toefl+7th+pdf PDF link annotation
    • http://suzamajotibe.mywebcommunity.org/comprehensive_effects_of_globalization.pdfIn PDF document text
    • https://cdn.sqhk.co/nujusowidom/fkwA7ja/rokojoganopobixas.pdfIn PDF document text
    • https://cdn.sqhk.co/tefaxobaf/xiahehc/the_walking_dead_season_1_characters_death.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/jgjdKYd/55317299666.pdfIn PDF document text
    • http://funasowuto.getenjoyment.net/35179077640.pdfIn PDF document text
    • http://kozugufasuroti.mygamesonline.org/ayurveda_quiz.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/suwemogara.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/puntos_craneometricos_del_craneo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/16bcf2c3-ef84-45cf-b2de-043fa2379cd0/conflict_resolution_examples_in_history.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_12feeee1208b433590cfdeac0f1dc651.pdf?index=trueIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_d80e0367352c468784340f05a289ede7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03d6733-3049-44a5-ba2e-9d76a0d38054/54172450104.pdfIn PDF document text
    • http://xuvuxipaga.epizy.com/suzuki_budismo_zen.pdfIn PDF document text
    • http://laribemexomog.rf.gd/35129848120.pdfIn PDF document text
    • http://lazazowoj.epizy.com/16690084518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cceb7ba0-7831-47df-bc18-cd2fbf9e8fd7/tutorial_arduino_ita_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dbb3210-747c-41f0-beaa-6907ba7f92b8/xasibuzoxizos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66a77f2-5be3-4dff-922a-d40099389c98/what_does_emotional_labor_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe53f55-661a-4069-9f2e-d0299159c9a7/buliv.pdfIn PDF document text
    • http://kogisovaf.epizy.com/the_windup_girl_chapter_summary.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_30828679b1c148ae8cbd95080894d15a.pdf?index=trueIn PDF document text
    • http://dujupopo.epizy.com/38832752281.pdfIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_b761187ca2914494b47da037c8f78fd9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c4f3e95-7440-4f8f-9d59-9a110823cc93/wizards_of_the_coast_dd.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_d6cddb15be25444782e8f466b1a7372e.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_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 5260 bytes
SHA-256: c4835d428974bd9e179cf02cf8828eeec5c49e083d2ce74846076a1b458de751
font_01_sfnt_off0001287a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287A 11452 bytes
SHA-256: e4cdc722803f589bc6a59080a8fa417d95dd96db9872a6cbabdb84365fa2e804

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