Malicious PDF — malware analysis report

Static analysis result for SHA-256 e629cb4b95dad4a9…

MALICIOUS

PDF

75.6 KB Created: 2021-06-14 21:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ce8449cbf991cf6306546b1b939e6cf9 SHA-1: 9e2ede2b946090f4d09f838442376646ca7c7435 SHA-256: e629cb4b95dad4a99fd3baf98303599c3a861a02257d3c3dfb69522f3453ae20
156 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 0.9960

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://infrive.ru/pbw?utm_term=ravi+teja+mp3+songs+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375080/normal_6018f6b9b79f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473926/normal_604af184e7838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381534/normal_6064b15b47c53.pdfIn PDF document text
    • https://varovofuzurido.weebly.com/uploads/1/3/4/5/134598094/fatewifumeli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451756/normal_6059e72014aa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_6044dde609d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458137/normal_605f95eadeedc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_60107f7a6027c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_602fa4ef20168.pdfIn PDF document text
    • https://safupoxex.weebly.com/uploads/1/3/2/6/132683070/2e21b0c95092b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_6036756a564c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493266/normal_60c4e40ee5d93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502721/normal_606a12f81c977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_60557b6d217db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_60481aba25e10.pdfIn PDF document text
    • https://jakuvuwokuguges.weebly.com/uploads/1/3/4/8/134891264/5465bfe1ce7050b.pdfIn PDF document text
    • https://wajeditaveva.weebly.com/uploads/1/3/2/6/132696335/2312179.pdfIn PDF document text
    • https://warujupegam.weebly.com/uploads/1/3/4/6/134687544/gujibejen.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/89c581ea-a300-4ad4-ae70-7be471f5163a/32285625582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9222d0e9-b3e5-4879-b1d8-61768c9ab487/3175227790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0d7b67-339e-4988-85c9-52514946256b/zoguzemexoburije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f8fdf8-860b-43bb-b060-dfb6ba5285f6/location_5_themes_of_geography_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04a2e4b-119a-492b-a2f3-6805b6446300/befiletesiwelopelozeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7081ebce-8faf-4113-9a10-1c3a84648cbb/what_age_is_watership_down_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92b3142f-4c8a-4b94-88d2-14c799b700e0/renabitiduboserumidojesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8cd7b33-1a44-4f75-9156-4a8415f982b6/zofaledud.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_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 5760 bytes
SHA-256: fbeed7bdec0330973373967e1b34674ab059485b0378039d2856805f9eb1de21
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 10584 bytes
SHA-256: 8be292c117159100b555de53b43c095805c9040cc82849ee930a021134f9c2f7