Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3211949a21188bc…

MALICIOUS

PDF

77.9 KB Created: 2021-04-03 00:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dc073543d853eef6056c58e264dd4883 SHA-1: 16d23d1a0b90790e671ddc0861f4817b0dbd0503 SHA-256: c3211949a21188bcba3f9807b42b2f45cceb92a2f0f4f49d23ff6c469f0c0f5d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=weber+spirit+210+parts+diagram PDF link annotation
    • https://xowavexinoj.weebly.com/uploads/1/3/1/4/131408618/6f1a9e38bb24.pdfIn PDF document text
    • https://cdn.sqhk.co/kowipopi/jiduhfO/91096658922.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/gjidq3A/az-_900_microsoft_azure_fundamentals_original_practice_tests.pdfIn PDF document text
    • https://pekubitox.weebly.com/uploads/1/3/4/4/134477952/52bbe7fd0722.pdfIn PDF document text
    • https://xowafoxupa.weebly.com/uploads/1/3/3/9/133986725/gupowivitenafefebu.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/aa2f1a27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_6b844eb4239f4e3888f403876a94479d.pdf?index=trueIn PDF document text
    • https://f6142301-0c02-44dd-b2c5-62cf9b3cd0dc.filesusr.com/ugd/ebfdba_c29b765f53f442d9a746c892b70d819c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/99059844515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa79b50-3375-4e39-bfbc-47a11cf8b68a/vuvofuzetidurejenesepij.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/jawbone_up_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbcd0645-626a-4000-9bec-54b1a660a821/sigakonitijuwejufijaruwox.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_59b3555e2b37495388b1f180c37e62c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52b31d1-2306-4e2e-aafa-f917e6be6c80/how_does_the_bushnell_phantom_work.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/bloom_s_taxonomy_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93ada2a-2cd1-431f-a71f-b419d29f6535/lejudewaza.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_96119d17948a4a7b98a3ab6ab2441534.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_df33a4bcdf1f46ffa4cad12736b0f92c.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 5296 bytes
SHA-256: 2c06c9a43ff9a761e5a6e32f87081b962f960a0f9c7018f99eec913810bc1ddb
font_01_sfnt_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 10564 bytes
SHA-256: 21d62d6cf8f7b923532ccf8fee7438595564e0ad881da80aed9ec0cb90f12f6a
font_02_sfnt_off00011ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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