Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d56124ca4263f08…

MALICIOUS

PDF

75.3 KB Created: 2021-04-05 14:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 41bba0f2445c5c6e2f736fd017b146fc SHA-1: 2e31865ff0148ee970efbdeb9c3ad8a7c5acc38a SHA-256: 5d56124ca4263f082631712ccad35d85c5b6aad09449ce56c24fc146a5f01f82
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ClamAV as 'Pdf.Phishing.Trojan'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicates maliciousness.

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 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://druttle.ru/strik?utm_term=what+position+is+best+for+headache PDF link annotation
    • http://perevod-card2card24.site/55277895523e5ukj.pdfIn PDF document text
    • http://persequenteamsohbet.com/pupesoxancl0.pdfIn PDF document text
    • http://usejus.club/is_the_turtle_beach_elite_800_worth_it5hpj5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456372/normal_6068835e45546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_6055a4c27155f.pdfIn PDF document text
    • http://hallop.xyz/what_is_your_zodiac_sign_if_your_born_in_augustsfnzy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ginutu/nawuja.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_cc0d1ba436a6487f9349fd62fbe3d356.pdf?index=trueIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_d0f197349f914b8cb9c52fa0894fe2d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/86020316244.pdfIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_01d5a6ad86da41f0b807ea30a2f6d016.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fodose/sonos_1001_error_code.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/rojidebedebifezebiwesu.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_f64851e549464f649e5f54f47a499d57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/2678021281.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/9127902511.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_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 5364 bytes
SHA-256: 79cf0641b3d591e2099ea19ba20deb07638896ebd05ec3ce184c8215c96d8ac8
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 10652 bytes
SHA-256: 822e00e9a8ac310448c5651aeeeb53f679a7060a0c388c997c825699747faca6

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