Malicious PDF — malware analysis report

Static analysis result for SHA-256 509396bd72da841d…

MALICIOUS

PDF

102.6 KB Created: 2021-05-31 14:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b2adf13d9007cfdd0c287fce03b8005c SHA-1: 2f7d3363102470ce1b4c88663dad25aace77ad7a SHA-256: 509396bd72da841d759ce4221f26fbc624f03c9e13dc484b82c1d20bdec8aa61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm or phishing lure. The primary external URI points to a URL that appears to be part of a SEO spam campaign, further supporting the phishing and link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://xajibur.ru/strik?utm_term=is+emerson+tv+a+smart+tv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463010/normal_6043b32518a59.pdfIn PDF document text
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/8178330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389097/normal_5fde32dc21cb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403688/normal_6004901151354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_604fd4b3a1db6.pdfIn PDF document text
    • https://kapomubevobi.weebly.com/uploads/1/3/4/6/134681937/f1514d4cc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_600c147ba2981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389127/normal_6011c79915d79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471106/normal_604b152c26404.pdfIn PDF document text
    • https://navijaxilof.weebly.com/uploads/1/3/2/6/132696044/8680297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485801/normal_600f2d1c95714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_6038ed11bc415.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4444117/normal_60b1c75aabc39.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/5097814b-99ce-49cf-9415-4b5d3111ce22/can_apple_watches_monitor_blood_pressure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/659e8afd-1911-4ba0-abde-71073b7b9f5b/evaluation_lecture_la_belle_et_la_bete_6eme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df1ecb9-4a1d-4244-b4e9-323cedb04eaa/78705261125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1bbf2b2-9cbf-4529-bdff-b01c623e0338/zewafuraxun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1ea338-9cb8-4f66-8811-b7bd6552e5ca/51822350420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa6aa522-02ad-41a0-a1fb-1c7994aab223/5834652448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f7e153-7d0d-4aa3-ae64-eefeb245551f/95277713041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c7da6f-345d-4186-a80d-09eb3b787752/11820792705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d1a59c-6677-458a-b93e-7d9318837e8d/astro_a20_xbox_series_x_transmitter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daeb35ef-bd8a-406e-a4bb-541c894cffd6/niveles_de_lectura_y_ejemplos.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001524f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1524F 4796 bytes
SHA-256: 6de01e4c53af328560b80ac89f1667b4802c655ddccf21245c2700023bec430c
font_01_sfnt_off00016285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16285 12188 bytes
SHA-256: 99c2bf23337c9c389f7a9eda0d60dc0f8d70ecd85d7f13caa25c74d4f5c16af6