Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce3384bfd5317ed…

MALICIOUS

PDF

77.0 KB Created: 2021-04-05 21:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c83ffea5957a1df4b638258dfdbe2597 SHA-1: d2dafb8c43df92d4d2c351549d30e1189110f66c SHA-256: 5ce3384bfd5317ede1f5c8b1fccb7c038b1abb50ea186dc5267cbaf2e6343ca3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'human resources books'. No scripts were extracted, but the presence of multiple external links and the overall detection profile strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=los+mejores+libros+de+recursos+humanos+2020 PDF link annotation
    • http://elinekici.online/necromancy_minecraft_1._7._10_guidejn3ni.pdfIn PDF document text
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/tijileme.pdfIn PDF document text
    • http://nigma24invest.online/rokaxelirpsnxt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_601bbb03a01d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387218/normal_60057ff3896e4.pdfIn PDF document text
    • http://prizinsta365.website/57686309848xrtok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407729/normal_600bdea3af604.pdfIn PDF document text
    • http://sadovik.me/xokakosawe8zmja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472793/normal_601241e59731b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_600daed115a05.pdfIn PDF document text
    • http://odemebayisitrafik.com/79613611368s608l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_603180f88ebaa.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/wepekivawiki.pdfIn PDF document text
    • http://edayafar.xyz/13734710342mc1ho.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/55368189-9ad8-46da-bac5-28a7c1fb34bc/73774900876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16e2c6b9-a6ef-493e-a137-b40a0ca5d541/wudivukijururefolazekoxap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1fbfc2-38e1-460e-ac8c-18df65e241ff/free_easy_piano_christmas_sheet_music_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45afe6b4-4963-451f-8f15-d6eb0cc82582/african_american_short_stories_for_high_school.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_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 5612 bytes
SHA-256: d3681157dd3b567d1a2b66410d681b132b3c22322824cab695f5adcc50ba58e6
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 11928 bytes
SHA-256: e57dad22cb377cd29d9d37a3cb4e5caa159a7a2e64423130f5e827edbcd7dd8c

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