Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4b29497828cbed…

MALICIOUS

PDF

79.2 KB Created: 2021-03-27 10:31:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b137f32b1f284b9fe0b7d49dbbae23f8 SHA-1: 9f5819260d12a0a4be5afda2afa0cffda57c8e6f SHA-256: 2a4b29497828cbedd47f6beb3a26b273ab5064a600940232f160803dc856fb4a
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/award?keyword=class+12th+sociology+notes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491969/normal_6054f9313f887.pdfIn PDF document text
    • https://xexibuwowixuzu.weebly.com/uploads/1/3/4/4/134455615/842a723a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_604cf968eea0f.pdfIn PDF document text
    • https://zifusiwi.weebly.com/uploads/1/3/4/6/134686012/2128533.pdfIn PDF document text
    • https://bujajegufo.weebly.com/uploads/1/3/4/1/134108800/seduripa-fevutujibu.pdfIn PDF document text
    • https://zerasogamonan.weebly.com/uploads/1/3/0/7/130775055/8ce298d2946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_6037b59470063.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://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_4e96a003055d4c2ba93de3f3c8a75ded.pdf?index=trueIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_637555aaa84f47f89d3e87ee951b0fb5.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_ba6f9b6ea78f4a5690468652e723dc59.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_8403e3bfabb348fea12434322bdebbf3.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_54218590e0b949118777f9c8e29d0a5d.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_d9b14cd0d492441ea2a9812959a5a1f5.pdf?index=trueIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_71bfeb335a774a5eb4bac43c783a70bf.pdf?index=trueIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_69eeef16950149c4bbf7fee61f02bc35.pdf?index=trueIn PDF document text
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_4a0e80f0e0864cc9addfef7d8e6d6b53.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_20434c68a8bb4903981e8af8a5b59280.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_101d18aea4a64fdfaa96b313f97b4821.pdf?index=trueIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_2596e2b27f27487eabfc3e123980e096.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_45200ad007954ff3bd4c067f30302333.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_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 5420 bytes
SHA-256: 2742249cef5ec84555493d6194dedd2ae7201138cbfe13aaa79a5e29c69017ed
font_01_sfnt_off0000fca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 10576 bytes
SHA-256: 5c50ead7a4251a9401bda0bc946cc9f133148a45c25751f69b62854d2fcfa3e3
font_02_sfnt_off000120f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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