Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f9f4f83fb446d7…

MALICIOUS

PDF

93.4 KB Created: 2021-06-05 13:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2adf901aa1341cfc819c9259b7619d69 SHA-1: 1612564fc1d7edd9d0b35f45932a659ccfa9f478 SHA-256: b4f9f4f83fb446d72228f6bcae5fdd298919a992d6cdb6a185be1cbefb57abf7
226 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. It uses a password-protected-archive lure. 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 0.9990

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/pbw?utm_term=facebook+lite+apk+download+latest+version+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455902/normal_60462968ab1c1.pdfIn PDF document text
    • https://vafubetuxako.weebly.com/uploads/1/3/4/5/134503762/fikupiwutato.pdfIn PDF document text
    • https://fawewetipe.weebly.com/uploads/1/3/1/3/131379545/robonux.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369487/normal_60b36ab03adcb.pdfIn PDF document text
    • https://vugaxedugu.weebly.com/uploads/1/3/5/9/135971543/50f00cc0ed09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_604fdf2022302.pdfIn PDF document text
    • https://fevowavekotaxuw.weebly.com/uploads/1/3/4/6/134635114/7571694.pdfIn PDF document text
    • https://vevotudoxis.weebly.com/uploads/1/3/5/3/135313682/7586000.pdfIn PDF document text
    • https://fivipogokofabid.weebly.com/uploads/1/3/0/7/130776003/d12d6c.pdfIn PDF document text
    • https://veliwomi.weebly.com/uploads/1/3/5/3/135343105/d67cbabc8b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fevosezew.pbworks.com/w/file/fetch/144476097/romeo_and_juliet_unit_test_with_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167f48af-0c70-4c27-9fb2-7f57aca4cbc9/what_is_the_maximum_principal_stress_induced_in_a_solid_shaft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/335e9fb0-5696-4556-a7b7-1261a150ac48/41864458210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d540dafd-43b9-4b74-a3e6-6f8b425e9968/multivariate_data_analysis_uses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecafd86c-dedb-4dbb-8687-eca97b5f5ba6/cambia_tu_cerebro_cambia_tu_vida_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec3881f-20ff-453d-a468-a2f827dd990a/fewibujiwomakelujawipuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e00b1f-857f-4aad-8da4-db6d758ac921/65579668649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa4532be-f426-474c-a43d-81777879b397/95803398737.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/f/13233251567.pdfIn PDF document text
    • http://detomipipu.pbworks.com/f/how_to_cheat_on_csr_racing_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e5eca02-bfea-455a-85a4-8452514543c4/lakudimezimisizanufimoma.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 5652 bytes
SHA-256: 0b0ef1dd4121bf4f3784ca12f5ab8109f4ac1a20623826b2635b01cebcc52077
font_01_sfnt_off00010e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 3116 bytes
SHA-256: 4e275f4082b7c5f51b22dc1a280415e1e5dad1637864b300d04a8fcfdd010abe
font_02_sfnt_off00011b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B03 13236 bytes
SHA-256: 682a553cca6d5c30b229331df09044fdabe74ce07a3f619bf26fa443d4d953dc
font_03_sfnt_off000145a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A6 16916 bytes
SHA-256: 0ce0c0be2902f467c34a1cfe5b151e9eea070919d41f439ca2e2163d8808df41
font_04_sfnt_off00015d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7B 1736 bytes
SHA-256: 5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff