Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73869739d7b7864…

MALICIOUS

PDF

72.4 KB Created: 2021-03-25 17:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5a7cd2d46a0af439081988e037406546 SHA-1: cb7fd8d5f9a27f42d4d5a586f45d76acaa991d4f SHA-256: f73869739d7b7864d90030589b17a11ec0d5c19ee8e9ab42819815e7da4c9178
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body text is heavily obfuscated and unreadable, but the presence of external URIs and the heuristic firings point to a malicious link farm.

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://gimoguvi.ru/award?keyword=cahier+de+vacances+pdf+college PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445343/normal_5fe3e0cb4812d.pdfIn PDF document text
    • https://cdn.sqhk.co/sudidoxa/jhhgcx0/mizininibilevotitol.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/0vRPvgJ/tips_for_buying_on_ebay.pdfIn PDF document text
    • https://cdn.sqhk.co/xesofosirija/HFjjibx/dekibisimosukufavit.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/aJxijyq/18297520247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5fe6fdeab6d8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_9e8a870883de49299cb8277dfad209f2.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_666d1ae314144f9dbdaf1b3473f04165.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_d8d66d6e25a04bc2aa8bf57297286acd.pdf?index=trueIn PDF document text
    • https://a6047d18-b57f-4fdc-88fa-dea7715a8642.filesusr.com/ugd/189347_7ce83761200d4c0fbcdea05cae9bbe67.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezebepit/68175047973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de84e73-87b1-42a5-9851-dd6cf437e523/40702369812.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_68e6f004b7f5463fad87f06f5d05ad6e.pdf?index=trueIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_ad60e9869d404df8beea62c227e03419.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b9add0-1214-4f02-8b38-01fc7c260266/brother_xl_5130.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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 5384 bytes
SHA-256: 926bbb624962d6f9cf77dce43d85709af292ca84250debb32318399e98ae154a
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 11568 bytes
SHA-256: 720ed984f86cecf8d175703221b958b54fe62c30426355511399aa48420b8843

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