Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d33a4d2bc341f14…

MALICIOUS

PDF

91.1 KB Created: 2021-06-11 13:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6bca8a93efea7fcac6ff8b098245412f SHA-1: 91c7742e82cc78c87b91e51d981f82eaee017d34 SHA-256: 7d33a4d2bc341f1473a2c51db20c21c3be027c83a2181a516b689cbb414b7bd2
186 Risk Score

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 0.9992

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://medvor.ru/pbw?utm_term=an1+minecraft+pe PDF link annotation
    • https://nozojotama.weebly.com/uploads/1/3/4/5/134585139/8931041.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4527357/normal_60b3c820197ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402706/normal_604c99fce2287.pdfIn PDF document text
    • https://pufujodixig.weebly.com/uploads/1/3/1/4/131438007/sifosepelu_giresozokexi_fobakove_netebapimado.pdfIn PDF document text
    • https://gonalibage.weebly.com/uploads/1/3/4/6/134652093/ad40f152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452863/normal_60b9daa69d460.pdfIn PDF document text
    • https://rawubewo.weebly.com/uploads/1/3/1/4/131405976/lebuguwilenuzivuso.pdfIn PDF document text
    • https://fivoputan.weebly.com/uploads/1/3/1/4/131408393/xiwovajozegib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403118/normal_5feb96edccf65.pdfIn PDF document text
    • https://razosopowob.weebly.com/uploads/1/3/4/5/134509902/wavumulepur.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/puxifameti.pdfIn PDF document text
    • https://dujewukemapaf.weebly.com/uploads/1/3/1/4/131453220/8735823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144835086/6783339846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9999993-1a9b-4cf5-b69b-5df54c346811/soluce_cube_escape_paradox_chapter_2_chess.pdfIn PDF document text
    • http://jujupaw.pbworks.com/f/63822933162.pdfIn PDF document text
    • http://kekirow.pbworks.com/w/file/fetch/144713046/57841510082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/877c76a4-e532-48f1-ae79-66b8a554b2fa/60179770734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca4aa83-d4de-49b6-bddc-ef765f5f6b84/tipo_de_comunicacin_celular_que_promueve_la_cafeina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4944a188-52ca-4bc1-95d0-78d0622b1bad/sodisojimebelimipav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41566a8a-1e1d-4fb7-b3e2-d9f06ddb4b30/49887806299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68831c33-462b-4a96-a4cc-c25da31dc76a/my_kenmore_washing_machine_wont_spin.pdfIn PDF document text
    • http://jumogitakos.pbworks.com/f/metimukonogo.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 2900 bytes
SHA-256: 5226c763f3d4f3cbceb38bcb13217c6b3d4a8982263ccab1e51df51dbcfe70e9
font_01_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 4992 bytes
SHA-256: 688a31f086df892060513447e872c7e2550c72819e90ad586652ca535dcdbd61
font_02_sfnt_off00012273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 12144 bytes
SHA-256: 447bb0a32d153fcbe66ad447ac48fabc271de2fd80a0069c0dbaed635847665a
font_03_sfnt_off0001498e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498E 16184 bytes
SHA-256: dab5129c56c281374f63f870592dd4c61aaaed34ebfb3c0615d70f19fb506c8d