Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc04c2b7a0f5cbe…

MALICIOUS

PDF

78.6 KB Created: 2020-12-14 13:22:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2e9c111538087add7fd427085ab21f81 SHA-1: d8a89a5b83cb637d197f61e940a740aa7d2826ab SHA-256: 1fc04c2b7a0f5cbe4bddd5c162c2ad1b48c18a14e4e40abc4daecd346733b85d
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, suggests a lure related to a 'completion report' to encourage clicks on the malicious URLs.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=completion+report+construction In PDF document text
    • https://cdn-cms.f-static.net/uploads/4455185/normal_5fb541d112242.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387698/normal_5fc916fc7643d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_5fad6ba9adecf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446773/normal_5f9d458924288.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/lusilataviludova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_5fa8b746a8305.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc144a93398ff7515307f21/t/5fc504b718e72e5fdb7623f0/1606747319715/puvunaxatimevekorizadaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f69ab053-00b3-4be7-b0cd-dc7f9f7fd106/best_at_kulve_taroth_weapons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e2d0c75-cc7e-46f8-888f-250616435740/street_fighter_alpha_2_stages.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3799d60f2895dc1f82192/t/5fc817bb92e74531f3bd53a0/1606948795295/21064184459.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc007c924b06a7eb3fa3bc3/t/5fc1fa1f18e72e5fdb1e02d8/1606548000633/xunev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03dae4fb-ef54-42f2-9b68-ce34075ac9c0/pobenezibonevipulizij.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_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 4772 bytes
SHA-256: 0a84bd014f22488f143623e12b54e94345ec47f9a9484eedc4137d000ce3a793
font_01_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 11536 bytes
SHA-256: 7c91786a78b6c186f1f5e50973642c392827e9a92036b7b6ad79b256979d53f0

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