Malicious PDF — malware analysis report

Static analysis result for SHA-256 4333704ab4c81681…

MALICIOUS

PDF

77.5 KB Created: 2021-02-23 00:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 02b2f7083a6aaeaf02695146c3c7e2c6 SHA-1: fa3c74da4903a60798e2e8f2583c68a6f0186226 SHA-256: 4333704ab4c81681c3922845effccf7febff917e7b6b5b2b9cdd7cc20f1acf8a
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://druttle.ru/wix?keyword=time+warner+preview+guide+san+antonio PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473052/normal_5ffbdc4c1f0f5.pdfIn PDF document text
    • http://xelirap.22web.org/31112360769.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/rajobutuvanawegas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_601fd930ac46b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_601b076c5aca5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495550/normal_5ffd9a164a48a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_60311a40a0e09.pdfIn PDF document text
    • https://ketevifut.weebly.com/uploads/1/3/1/4/131453005/surij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_6025bbca09221.pdfIn PDF document text
    • http://najitop.22web.org/76507522256.pdfIn PDF document text
    • https://vutojakapejir.weebly.com/uploads/1/3/4/8/134895653/55d9160cda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465538/normal_6006fa9211202.pdfIn PDF document text
    • http://helpcontactform.com/15583997671lej6c.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/viregujipowuru/81140152963.pdfIn PDF document text
    • http://jovofixelojepod.epizy.com/dixefozunuk.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/felema.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_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 5348 bytes
SHA-256: b34613f74c9361bee8f3c82fe044012049600bdd96d2eeba94010c38a58a0ff7
font_01_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 15468 bytes
SHA-256: e395374bac5137c80306285fd19a33095038fef1267f4a1a4997f67fddd9ca17

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