Malicious PDF — malware analysis report

Static analysis result for SHA-256 2447f49479a2351a…

MALICIOUS

PDF

77.0 KB Created: 2021-06-14 00:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9442e40fa074ce8d705a268f84f5d9b SHA-1: e1819fdc822f501b17ab9dbfc2852aa4b8bc2c94 SHA-256: 2447f49479a2351aa721879ed704e13dd736804071f91ad947e6806d3bd39390
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. The embedded URL points to a suspicious domain, likely intended to host or redirect to malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/pbw?utm_term=throw+up+stain+on+carpet
    • https://cdn-cms.f-static.net/uploads/4392660/normal_601052a78067f.pdf
    • https://cdn-cms.f-static.net/uploads/4386836/normal_60b97fdb7db99.pdf
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/dubepi.pdf
    • https://cdn-cms.f-static.net/uploads/4417645/normal_606b55456538a.pdf
    • https://dugepenen.weebly.com/uploads/1/3/1/3/131379306/6008002.pdf
    • https://cdn-cms.f-static.net/uploads/4450147/normal_60b824ebb542d.pdf
    • https://static.s123-cdn-static.com/uploads/4371003/normal_60053ddf0c521.pdf
    • https://cdn-cms.f-static.net/uploads/4393028/normal_604935607967b.pdf
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/dujazifubibugavejigi.pdf
    • https://cdn-cms.f-static.net/uploads/4366020/normal_6041b0804720b.pdf
    • https://cdn-cms.f-static.net/uploads/4369797/normal_603f4b33981df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://buvavipoluvu.pbworks.com/f/57732288779.pdf
    • http://ropotupi.pbworks.com/w/file/fetch/145159347/53177838283.pdf
    • https://uploads.strikinglycdn.com/files/f321439b-2796-46cf-aef5-09c7a6b99afd/94106993482.pdf
    • http://mabigeroxoso.pbworks.com/f/61815827551.pdf
    • https://uploads.strikinglycdn.com/files/4830e98b-ff93-4676-9719-c6c3390d3048/how_do_you_determine_the_osmolarity_of_potato_cells.pdf
    • http://rijunepupuja.pbworks.com/w/file/fetch/144937707/5365441820.pdf
    • http://bevojoluvu.pbworks.com/w/file/fetch/144448065/product_costing_excel_spreadsheet.pdf
    • https://uploads.strikinglycdn.com/files/3a667dec-ca87-4f6d-ae49-5a0233a91918/94856367877.pdf
    • https://uploads.strikinglycdn.com/files/156eeb0e-59dd-44bd-8135-39398737fe66/bemidofazasijowi.pdf
    • https://uploads.strikinglycdn.com/files/b417168b-4310-41eb-a3eb-cf617c3b6874/5e_sacred_oaths.pdf
    • https://uploads.strikinglycdn.com/files/7fc142a4-7139-4850-a605-bc2410480f00/gikigafujetejemaruberobix.pdf
    • https://uploads.strikinglycdn.com/files/cd6277d2-96ff-489a-959e-fda2f752d070/57677172992.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c2.bin
10fefcebe068d7ed9dce10737f70525be02180207e181985e256c1b3d2f09e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 4912 bytes
font_01_sfnt_off0000f582.bin
980bb9a13615abf42b2ce6be604b512843c129bb6df48e6f9878e7d31513f986		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 10252 bytes
font_02_sfnt_off0001189d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 4324 bytes

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