Malicious PDF — malware analysis report

Static analysis result for SHA-256 14331fd62380b199…

MALICIOUS

PDF

76.5 KB Created: 2021-03-13 23:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fedbff1770c9300916fdae32f5ed33d SHA-1: 758b13d46b7e9e38f5726ae90c8f594d64e6c74d SHA-256: 14331fd62380b199b7da45aa948e29982abeb30087bb20abb5a6b451bc6da5f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains embedded JavaScript and a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The primary URL, https://jacksth.ru/strik, likely serves as a landing page for a phishing or malware distribution campaign, disguised as educational material.

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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jacksth.ru/strik?utm_term=factoring+trinomials+guided+notes+pdf
    • https://cdn-cms.f-static.net/uploads/4386095/normal_60192a3834c16.pdf
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6020bc05df1ca.pdf
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5ff303e662944.pdf
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/tefumasamisituwi.pdf
    • https://cdn-cms.f-static.net/uploads/4497358/normal_604101504eb5d.pdf
    • https://gikemadisasov.weebly.com/uploads/1/3/4/6/134667176/9000363.pdf
    • https://zabonipe.weebly.com/uploads/1/3/4/4/134487368/jutixe.pdf
    • http://javaxirivibewi.mygamesonline.org/marcos_o_evangelho_dos_milagres_hernandes_dias_lopes.pdf
    • https://static.s123-cdn-static.com/uploads/4388156/normal_5ff9773777aa3.pdf
    • https://kizofirelurok.weebly.com/uploads/1/3/1/6/131606598/lukodojudi-viwubokadotad-vekimamizesu.pdf
    • https://padixegidenu.weebly.com/uploads/1/3/1/1/131164435/pipisedu.pdf
    • https://datuzela.weebly.com/uploads/1/3/4/1/134109276/926852.pdf
    • https://powufekati.weebly.com/uploads/1/3/4/0/134012492/dudigivafar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wiwosotu.myartsonline.com/43643551989.pdf
    • https://uploads.strikinglycdn.com/files/8be9fdd8-b2b5-43e8-a89c-834e5051f11a/the_standard_401k_phone_number.pdf
    • https://uploads.strikinglycdn.com/files/318b4b5b-d9ff-4d70-b59b-9dbf8c28b7ec/vosodip.pdf
    • https://uploads.strikinglycdn.com/files/09794c9a-e16e-49c3-839b-ef3845a53336/91032726202.pdf
    • https://uploads.strikinglycdn.com/files/d49cfb27-1eb0-4bff-8adb-da43448fe745/51763929958.pdf
    • http://likutolejit.onlinewebshop.net/construct_2_free_license_key.pdf
    • https://uploads.strikinglycdn.com/files/c159b11c-b336-44ae-8fbd-f23e08571e10/visesoxoletipisigiz.pdf
    • https://uploads.strikinglycdn.com/files/6072202d-6a2a-404e-b1ac-712e4c252801/16944350724.pdf
    • 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_off0000ed6d.bin
0f1b358bc188049f6fd367cafea7b577c6918334394ffd32524ca623d6b826b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 5432 bytes
font_01_sfnt_off0000ffd1.bin
f02a6dee1558311a9360022d4d26b7608ac1a11303a5bcdf27c201985e84ee85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 10760 bytes

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