Malicious PDF — malware analysis report

Static analysis result for SHA-256 3824484ee1728887…

MALICIOUS

PDF

80.5 KB Created: 2021-05-22 22:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7e922195eca0a5117f3ac6120f4d073d SHA-1: d4ab65875334250e4a002e71d027b097835a566e SHA-256: 3824484ee17288874a52313def68b1dff2ba3aacc9f5ffefb822b98241848e53
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://midufefew.ru/strik?utm_term=how+to+write+a+legal+analysis+memorandum PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373016/normal_60217e041d4dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_6062195b110fe.pdfIn PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/56912a19.pdfIn PDF document text
    • https://pabekebu.weebly.com/uploads/1/3/5/9/135990513/e1c9e2f7f.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/3410621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_60530871778b7.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/7040368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423442/normal_5fceb0488c51a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453764/normal_5fe80d6fadccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424364/normal_604f8e8ab034a.pdfIn PDF document text
    • https://didiseripipake.weebly.com/uploads/1/3/4/3/134344006/wokebuzojononewax.pdfIn PDF document text
    • https://betozuwozoz.weebly.com/uploads/1/3/4/1/134108580/foduz.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/jijezeniv.pdfIn PDF document text
    • https://pudixibavumop.weebly.com/uploads/1/3/5/9/135964902/ludemotuxawito.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/02e251c5-9f1a-464a-9779-d336e0ac7b85/33451317307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e21ba0c-359a-4caf-84e4-25b026122d8c/cisco_dpc3941t_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8803c0c7-53ac-4919-a6a4-2f43445d1320/suzusizilola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6880a8c-ec04-4684-8575-d8ba5ad63c92/27488693689.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 5300 bytes
SHA-256: ff0628bd1263b0ee961373c95a3210a3550aad88c832c971bef007990878879a
font_01_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 11344 bytes
SHA-256: c47342479290b88801837fe31344ed432a52d08f6c012f2e3ae96a1cceb891a1

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