Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef711aace4bb0774…

MALICIOUS

PDF

86.1 KB Created: 2020-12-16 22:05:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1a2d711e5cf29affdf4d5d6786b38b4d SHA-1: b9eb9b06ed54dc4adf87b96ff79bc0d8cfab28a6 SHA-256: ef711aace4bb0774e5427ee1d37cbfa14b31395bb05fa81bf1621a9f4f61f603
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 are to link farms, indicating a malicious intent to distribute traffic or host malicious content. The ClamAV detection and ML classifier strongly suggest this is a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://traffset.ru/strik?utm_term=progressive+verb+tenses+worksheet+free PDF link annotation
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/mijevekubo.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/2556251.pdfIn PDF document text
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/taxadifupesafutom.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/a7c41d.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/9bb561418.pdfIn PDF document text
    • https://gebipobewixaduk.weebly.com/uploads/1/3/4/6/134631326/zesekasetede.pdfIn PDF document text
    • https://fexejolimoti.weebly.com/uploads/1/3/4/1/134131812/ad62ea08b5a.pdfIn PDF document text
    • http://www.opentle.orgIn 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://static1.squarespace.com/static/5fc67dd2abaecd331848a494/t/5fce44e3c00f007cea15e0d0/1607353572302/fapemumolewo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d49a16f6d44b07be6b5d/t/5fc235345147b148047c671e/1606563125343/bob_duncan_exterminator.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc527a3c6229360ecc88336/t/5fd67ac213a48350e8160938/1607891651020/p5_futaba_confidant_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb590ed7-cc4e-4d55-9e7d-996924586eda/10564365427.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfec92c6de34c7a392863/1606221514044/glass_etching_kit_michaels.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2aad3ab79f442f234ede7/t/5fca1272d7c3040d8737d49e/1607078515406/mifev.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/herbal_plants_with_pictures_and_names_and_uses.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/torogokabametila.pdfIn 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://www.gnu.org/licenses/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000de94.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDE94 12732 bytes
SHA-256: 87e4ded74c24d107ae33a5a58b5faa2ef2fd48847d233fb8e3655d32d58d6791
font_00_sfnt_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 4932 bytes
SHA-256: 54b1e69cce42eadb2a27c1f65e3f0ad5f68da75a84b18aa4a19a27941e3ca81b
font_02_sfnt_off0001024b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 10788 bytes
SHA-256: eb5fc091cffadf3a36ec5736132f13a4774d2319544cf58a349002a5e836971b
font_03_sfnt_off00012777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 16172 bytes
SHA-256: 6576b681790e312c7bc36623758e9b1e6ef584c46d127b24d8a951a3bc2d2671
font_04_sfnt_off00013c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C70 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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