Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f7474e22ae9500…

MALICIOUS

PDF

73.2 KB Created: 2021-06-01 08:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9fe78f27ec8215fe5ab0cb3344f2e464 SHA-1: b4f72b854a2e26f53872a2f0f56c0badd44e8c95 SHA-256: 72f7474e22ae9500e2e7551ec41c1aa051b64777d629e5a4df149c78976efe2c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of an embedded URL and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are strong indicators of a malicious document, likely intended to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://lozipotod.ru/123?utm_term=epic+seven+equipment+set+guide PDF link annotation
    • https://nosokubidudat.weebly.com/uploads/1/3/4/3/134321305/gabefemule.pdfIn PDF document text
    • https://jipafopabos.weebly.com/uploads/1/3/3/9/133986828/gikasedap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_6059d12054e3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387703/normal_6001915574453.pdfIn PDF document text
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/27918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447658/normal_602fd4044d561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416934/normal_606e1569b8290.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_5fffdd58d300e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472484/normal_5fd045edd2f00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5ff55bd076467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_600b71b1191ca.pdfIn PDF document text
    • https://lafapimiwegu.weebly.com/uploads/1/3/4/0/134041150/6fd2b2d9.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/915942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5fe8f9a370967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_605df24e73fa7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426687/normal_5ff970ae8fd17.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/542970b8-1267-483f-a851-bdf6e4ba9108/sustainable_development_goals_report_2020_citation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50146b0f-20a4-42dd-a6e6-e705390ab7c6/dagokutar.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_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 5200 bytes
SHA-256: 5fc5e0e29d5dfdc16e5176c68ed3ef5a62465d16c21e0d3ef654b6dd2bf56ef7
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 10756 bytes
SHA-256: 6b60207716f0b970fe5560130aab5bab58f712d0c4b6854402fc932d8acee64d

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