Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ae40a623d07afc…

MALICIOUS

PDF

81.8 KB Created: 2021-03-22 07:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d042fb234adaf08c0fc92ae3a69b7d5b SHA-1: e79334e9d16cc82e0baeed2b4b165a00cbba1359 SHA-256: e9ae40a623d07afc8fe713966097384fedec90825f7cbdd948b2e462d17d7250
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the document's purpose is to drive traffic to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://mezovuduw.ru/123?utm_term=aditya+birla+life+insurance+premium+receipt PDF link annotation
    • https://xukotonaxi.weebly.com/uploads/1/3/1/4/131453431/9821775.pdfIn PDF document text
    • http://firstsecu-paypal.com/14713069500ncvgs.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/5711927.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/kowolotaze.pdfIn PDF document text
    • https://cdn.sqhk.co/suvezadamut/iadg2je/80299280403.pdfIn PDF document text
    • http://kemytbok.xyz/gone_with_the_wind_book_imagesnwo05.pdfIn PDF document text
    • https://lowaribopuvege.weebly.com/uploads/1/3/2/8/132814272/vokubuvamupu.pdfIn PDF document text
    • https://najovukuno.weebly.com/uploads/1/3/1/4/131453374/dobokade.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/ffxEiam/rapid_sequence_intubation_guidelines.pdfIn PDF document text
    • https://gixovazaviv.weebly.com/uploads/1/3/5/9/135982549/2644428.pdfIn PDF document text
    • http://autokenn.com/60165268956k80yz.pdfIn PDF document text
    • http://amin-ukraine.net/a_uma_dada_temperatura_2_mol_de_h2gfadu.pdfIn PDF document text
    • https://danivuzi.weebly.com/uploads/1/3/2/6/132681213/pevosexisefura_fozunokisazad.pdfIn PDF document text
    • http://idslim-italia.site/the_republic_of_tea_detox_green_reviewsiyieo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_cf05a2ffdbfb4a1b9a5d884fd9a7521f.pdf?index=trueIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_2e04519e9c894b7ca5ffae05fe71b5c1.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_58e417b260a24ce596ed23b77f7acdf4.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_54f557cf87fc42289d9b9be5d56697c4.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_116a172daadb4d7e95ab12fd77e9e027.pdf?index=trueIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_0fedd49b5c4c4e65a8ac7689883750c3.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_1052315a307b409aaad0755c0373c80d.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 5532 bytes
SHA-256: 457c9d218f25c2c9e55e18e79caffdbb02324bec536680d6933b4b3928553df5
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 10848 bytes
SHA-256: ff491f33decaf1c58bbaa5fe792267b320050259cb8acc59f71c28f8122cdd8f
font_02_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 16080 bytes
SHA-256: 01918ab328aad74c9e8f640f01f786fd0c2e0e9f3673bd8045474dd117871356

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