Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9dc7612fb9299c…

MALICIOUS

PDF

78.9 KB Created: 2021-03-18 10:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 99a443cf3507bc8944a9742e42d7d447 SHA-1: b034ed28d3e23b07d9fc1c1d7e280077aee5cefb SHA-256: 4d9dc7612fb9299c13c0ef9b46429028713d825b01a64d04f6aa33dffae7b31e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript, though not fully analyzed here, likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/award?keyword=machine+learning+algorithms+pdf+packt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446494/normal_600e690220d23.pdfIn PDF document text
    • http://zuwazekanusur.mypressonline.com/beginner_english_course_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_5fe9572d8af6f.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/bmp_image_file_format.pdfIn PDF document text
    • http://freud.icu/jurobebap30j4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427086/normal_603fd185a1a38.pdfIn PDF document text
    • http://50offstore.info/structural_engineering_reference_manual_8th_editionbu8xt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_5fd7ac7910611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_601cff913e09a.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/vovabagubajegeb/66922860969.pdfIn PDF document text
    • http://fikelamizogu.myartsonline.com/77990579938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77bee6e4-eeae-4ce2-b5df-06c5fe2858e8/29042689223.pdfIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_d7331bad86ea45f0a82896099cd08bc0.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_30b0a1a1aab942efbf40302dc3d35f9b.pdf?index=trueIn PDF document text
    • https://0404cab7-c021-4537-be79-420bcb2f88cc.filesusr.com/ugd/52c240_2be9e77c6da04f0d940998d8ced43184.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8e7ce8-a650-4823-be20-2493e1cd06cd/cyberpunk_2077_release_date_ps5_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710caea4-965b-4798-b4de-a924bb93b3b6/como_quitar_formato_de_fecha_en_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/54114234126.pdfIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_0944dc083b724aadb6fa83291180f7b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea2a766-a347-4657-b83c-bc7997420fe4/72054750896.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_d39ea114306647858c1a0a8537287cb7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 5640 bytes
SHA-256: 805acc0c1cc46351143bf0381e01bb1baeb8a5e9530e2aef75200e803b1d26a7
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 12096 bytes
SHA-256: 01dab972b44b31f81617953b126ac5823b1023e43182eec8d7f1999b3ffcd8d5

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