Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd3d30d64eaf7da…

MALICIOUS

PDF

83.7 KB Created: 2021-04-03 05:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2a49f28a843497c48b204ce461f5c322 SHA-1: 5c43021e9e0fbceae15790f7c83fe16eea347876 SHA-256: 8bd3d30d64eaf7dae6da61a6ea6c5a0d4550e8e4e73c77b69a5e228bdc7b6888
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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.
  • 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://nipisod.ru/wix?keyword=acquisition+of+alaska+political+cartoon+ideas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388285/normal_606733b38b81f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_601c861390a4e.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/50667950075.pdfIn PDF document text
    • https://rirofogarerena.weebly.com/uploads/1/3/0/7/130775169/0b05d18284.pdfIn PDF document text
    • https://fojojaroj.weebly.com/uploads/1/3/1/4/131453509/b9d439416d9.pdfIn PDF document text
    • https://lomofatawepap.weebly.com/uploads/1/3/4/5/134599642/a3bce96a45f.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/how_to_reply_professionally_to_a_thank_you_email.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/1033b349-3d4f-4545-95b9-4040198cee7f/relative_standard_deviation_ppt.pdfIn PDF document text
    • http://tikimiwuwal.myartsonline.com/95609249189.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/chosen_a_house_of_night_novel.pdfIn PDF document text
    • http://zimopup.myartsonline.com/mvc_framework_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/astro_a50_manual_gen_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/86258254190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a69afd-bbb0-49f8-b1d5-18f84fe1823d/the_eyes_of_the_dragon_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/90883454378.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/bebawom.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/40237219457.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/gophish_template_example.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/70614893874.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_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 5328 bytes
SHA-256: 8d303f45392094fcaa0c4981708349182c76a97e7a66d8f3af32accd83559f60
font_01_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 11148 bytes
SHA-256: 1d48955a8253e3a43520b46d55f4d796f6ad249d7f296afe9dbfc4ddc6563120

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