Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb31632fd2662ad4…

MALICIOUS

PDF

71.9 KB Created: 2021-02-12 15:10:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 04512ea86370d0161fa7f386c88246d1 SHA-1: b918a9fbf57e2547a89d7b8fa80794ad229c87e0 SHA-256: fb31632fd2662ad4c4d9e4c3813d97194db1e1c6ce9688e6f414cd240da52d8d
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/wix?keyword=whatsapp+plus+apk+july+2018 PDF link annotation
    • http://momsmall.space/kufogawunasuduxajinamap0nsap.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/gidha_boliyan_videoza16g.pdfIn PDF document text
    • http://afracheat2.xyz/zavadowarewsyv60.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/bebojuvebiloluk.pdfIn PDF document text
    • https://pulavirovedozas.weebly.com/uploads/1/3/2/6/132695401/7510022.pdfIn PDF document text
    • http://clientbluebadge.com/beautiful_star_of_bethlehem_hymn9sdss.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/hagfrib/perplexus_epic_3d_maze.pdfIn PDF document text
    • http://egosikenclub.com/bruel_kjaer_pulse_labshopc0zbm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_600dda08e261b.pdfIn PDF document text
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/3789942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452618/normal_5fedaa42ef769.pdfIn PDF document text
    • http://frontglass.xyz/51032126327htoej.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/dzmCdij/rumble_on_news.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5fe513ab321af.pdfIn PDF document text
    • https://cdn.sqhk.co/muresogus/o3hc6jg/ear_clinic_singapore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425913/normal_600e0378e8ae9.pdfIn PDF document text
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/xiweji_pezedu_jenefel_kezewuper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482870/normal_5fd2a1bb023b0.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
    • 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_off0000cf9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 5084 bytes
SHA-256: b2dca80247cf0f2649fbc43db5fa9a4eeec4404f3ff5f269a31a03b420db4c2d
font_01_sfnt_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 10412 bytes
SHA-256: 914e27391465b09f50c1ddbeefab8cdc6f9f5baaa90f9e5c712cc4ac27951db3
font_02_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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