Malicious PDF — malware analysis report

Static analysis result for SHA-256 39083f4daa57244b…

MALICIOUS

PDF

115.5 KB Created: 2021-02-23 14:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3dc7d35a781000098f36172c3c6fe4dc SHA-1: 47791dd675aa8fc54cb77d1e9062872602525ea2 SHA-256: 39083f4daa57244bd7e3ad07de56f6a4f95b8f7e00bcba2a92d2480445e03207
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting or potentially malicious domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm designed to host malicious content.

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://baarspo.ru/123?utm_term=power+run+playbook+madden+20 PDF link annotation
    • https://lufodeku.weebly.com/uploads/1/3/4/5/134586195/05a0b90b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457876/normal_5ffc4c2c99762.pdfIn PDF document text
    • http://beramomu.22web.org/54559477826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_6014ad292f308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426257/normal_5fd2630956f24.pdfIn PDF document text
    • http://mangalvpodarok.ru/653345187633nart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481068/normal_5ffec06856112.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/0e9d45bcd.pdfIn PDF document text
    • https://zoxopabetil.weebly.com/uploads/1/3/1/1/131163737/6319206.pdfIn PDF document text
    • http://shoop-fr.ru/19409613422n8tql.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/5726091.pdfIn PDF document text
    • http://alphabitx.com/what_is_your_favourite_pet_dogyr9r5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410191/normal_5fe15f28402e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_6025883dba596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_602fcf62d808f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_6016a68b1ec3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tefinavi.epizy.com/37408416102.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_off00018532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18532 5600 bytes
SHA-256: 52b34661820a115150e84495c12d859a79adc1a1f2ccc0d4326d7dc6bf07a80c
font_01_sfnt_off0001983d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1983D 12284 bytes
SHA-256: 2591321578eb3dc18812082550f872e7456057be6dbe841da92815ca553b4485

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