Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc79708a1c8d0924…

MALICIOUS

PDF

68.1 KB Created: 2020-12-23 05:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ab8c502d927699e360852e841863bb33 SHA-1: 39271305c282ad6b9710eea670f7ec10ad844adb SHA-256: bc79708a1c8d0924c27ee33ce48863c18e64f440fcac0b8649df81cce79bfe72
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 0.9997

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://traffnew.ru/strik?utm_term=oxygen+concentrator+for+sale+ebay PDF link annotation
    • https://zekulereloto.weebly.com/uploads/1/3/2/7/132710655/gubigitorixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403937/normal_5fd12c1f1d0ac.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/c974aa14-aed3-4e7d-9059-3edf557742b3/65563455240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ab80ae-fc9c-4462-b6d5-adc433a55d87/56772081702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb95285f-b888-4438-9dfd-bc820d2373b7/voice_changer_for_discord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e5dd3e-cd21-43ab-a729-9fd1a89a2ea4/88766712122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2aa3154-59c5-4f3b-9c26-eb6954d44b1a/bugonoxiluti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/271cfb37-2f51-45f5-b0bd-1e97a86a80b8/11628047673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d8eade-140b-42df-91e9-3a5b37b7475a/xudubotibuzoramexopasin.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea21e2fce462bc8c0024/t/5fc364879ee0f32b87beaf91/1606640776883/21840148843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5d50c4-bb12-41b7-b0c7-90d45706abc0/dowupujazob.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_off0000cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 5388 bytes
SHA-256: d3ce35164b30817b478a359cf6883808a38c29cce6d9beb3d40245ddf0b1580b
font_01_sfnt_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 10476 bytes
SHA-256: fa72976263c2742970a9d872a14b7fc39a101303d0de3e114ba38b15348eb05f

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