Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a79f8daff107a8…

MALICIOUS

PDF

79.1 KB Created: 2021-05-17 07:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 670a4acbf1b9e017b6c819fe7e76c4ec SHA-1: bb23687390535e0626fe53ea9a956c9edb21c690 SHA-256: e8a79f8daff107a81c27e24f56a058cbfba1af10a64929516a33334821c2d1cb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on file-sharing services, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+improve+5k+time+training+plan
    • https://vazatevetag.weebly.com/uploads/1/3/0/8/130874289/6738974.pdf
    • http://bebalezuve.medianewsonline.com/todukujabudonugomaze.pdf
    • https://bunikesetula.weebly.com/uploads/1/3/0/7/130739723/4802346.pdf
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/norupabafulali-dolide.pdf
    • http://sagedix.medianewsonline.com/wixiwotenimajijojadi.pdf
    • https://telumenodizoxop.weebly.com/uploads/1/3/4/2/134266327/d8f489c21061278.pdf
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/c06477b687531.pdf
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/robasegirad.pdf
    • http://fumizudo.sportsontheweb.net/31015700172.pdf
    • https://xarudaxukisa.weebly.com/uploads/1/3/4/0/134018653/faduvavuxutux_wewugaselele_tisaxose.pdf
    • https://nomuwasu.weebly.com/uploads/1/3/3/9/133997615/gigusovitog.pdf
    • http://davorivugexawu.sportsontheweb.net/vocabulary_words_with_meaning_in_urdu_and_english_download.pdf
    • https://siwovipon.weebly.com/uploads/1/3/4/7/134705210/9180075.pdf
    • https://lurenejaxerugu.weebly.com/uploads/1/3/4/7/134728533/rinoferuxutudowez.pdf
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/kivifawabiro.pdf
    • https://rikovikoxeko.weebly.com/uploads/1/3/2/7/132740842/7390615a86.pdf
    • https://pebuwopaduve.weebly.com/uploads/1/3/4/8/134853156/2724482.pdf
    • http://pidagenavuziw.mywebcommunity.org/ginunipevat.pdf
    • https://zedafirulatako.weebly.com/uploads/1/3/4/5/134584693/4224881.pdf
    • https://bujevajixa.weebly.com/uploads/1/3/1/6/131637668/8814087.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1f9cfe0c-d655-4514-b58a-75380282e405.filesusr.com/ugd/d31784_dd43786a85ef4d2a82517c5e45695d9f.pdf?index=true
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_79af6a27259448c091c4dfda3d3bd4cc.pdf?index=true
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_554db451855e4f38bda06df29d750f27.pdf?index=true
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_d290903e213942d88ad0f3921738247c.pdf?index=true
    • http://gulagopafed.onlinewebshop.net/38_bcs_written_result_2020.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67c.bin
ef3cd094ee00ce367652d80da65e5f80d9a886a2d4333b78a9d11ab80d1cac8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 5264 bytes
font_01_sfnt_off00010868.bin
6130976daeb9ecdd92c31fe4b812d2cbdc112e41d688a645005e8ddd81c8242a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 10776 bytes

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