Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7ce395f2eeb085…

MALICIOUS

PDF

99.3 KB Created: 2021-05-03 12:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7c9e6e877fd2afe68281631b6bae7f7d SHA-1: b377dd8cda76b363c68fb7fd7aa643dee0bef0d7 SHA-256: 4e7ce395f2eeb0854e73ffdc33ce64edb2abec73d6c57b0a0f7c47bd9d68512b
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 0.9995

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://maypoin.ru/strik?utm_term=what+do+scientists+mean+by+tipping+point PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474988/normal_5fde9e97bd5a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413705/normal_5ff18c17c9417.pdfIn PDF document text
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/tizeren-nabovedegas-tivape-texaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462993/normal_60566a4c90ebb.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/54f9787.pdfIn PDF document text
    • https://rodironamo.weebly.com/uploads/1/3/5/3/135347674/435357.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/36bacc3b5.pdfIn PDF document text
    • http://susasami.22web.org/sivonageruwesiva.pdfIn PDF document text
    • https://palotuzumi.weebly.com/uploads/1/3/5/9/135991270/7146000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_6fad9304f5b442479471f564d42a2d0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64810b1e-97d2-45db-af85-58adb4899528/63845983788.pdfIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_587b1020b7dd494cbedd1f50350e196a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fac83f2-bc4d-44f9-9fbb-d31799fa9d11/siemens_plc_programming_tutorial_for_beginners.pdfIn PDF document text
    • http://wubavon.epizy.com/mufuru.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_094918391ada4daaa6d7ff849cdb63e2.pdf?index=trueIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_99921bc6239146d6bf2619432d793be0.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_e29164d795a44f90bfa38fa2ac1b0c48.pdf?index=trueIn PDF document text
    • http://jimatisejur.rf.gd/dmlt_biochemistry_notes.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_9fdda75571b14925861f2eeeb59b28cc.pdf?index=trueIn PDF document text
    • http://pulijivugis.epizy.com/51449694182.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_10ff1b02016846bdb3041b7e70901534.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_208e46fbf83b4082a606871e2308f7f8.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_off000144d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D5 5616 bytes
SHA-256: d08dd664ee51bc427a54d2acd2522836e233558a0a05386cad75a8b3c17fa1cb
font_01_sfnt_off000157db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DB 12232 bytes
SHA-256: 096e3cee72873ebed7a4522cb2c681d935f0d74df57b1a362e5098b36397a9b7