Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa4852792cfee01…

MALICIOUS

PDF

98.8 KB Created: 2021-03-14 07:19:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0006649f0646489bf61c0004761b09f9 SHA-1: 8ccc5709cae3ad31f777899dbd97a55127db6042 SHA-256: 9aa4852792cfee017643315a38e04e5a8723253003514199d3a170a07a10e0f7
164 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one specifically disguised as a 'GST annual return form' to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://golowaki.ru/award?keyword=gst+annual+return+form+9c+pdf
    • https://fejevudud.weebly.com/uploads/1/3/2/6/132695511/rugizuxinisuzix_doxazakoma_vejobisuk_saluxofevidubo.pdf
    • https://firulozide.weebly.com/uploads/1/3/0/7/130775295/vamezukezoga.pdf
    • http://pumorux.medianewsonline.com/dragon_age_asunder_free_download.pdf
    • https://numibogag.weebly.com/uploads/1/3/4/3/134323011/1468487.pdf
    • http://fasekafalig.scienceontheweb.net/14112343364.pdf
    • http://gamukanemafutu.mywebcommunity.org/tomewebu.pdf
    • https://wafilanukeg.weebly.com/uploads/1/3/5/3/135309269/wujixizub.pdf
    • https://nufulukoveta.weebly.com/uploads/1/3/4/7/134700555/7473305.pdf
    • http://fezatubiwe.getenjoyment.net/numbers_meaning_in_the_bible.pdf
    • https://sunakolezapomuj.weebly.com/uploads/1/3/4/6/134698053/lokamego.pdf
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/62744.pdf
    • https://vixevugipun.weebly.com/uploads/1/3/5/3/135327752/jujuxodoron.pdf
    • https://nixujukasal.weebly.com/uploads/1/3/1/6/131636737/pidituwawezuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_5bae474f254246dea2d1e4d8c6a95fc9.pdf?index=true
    • https://s3.amazonaws.com/fizufapu/checksum_transformation_in_ssis_2016.pdf
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_79061e9a481541b09e7abdb4626deaf1.pdf?index=true
    • https://s3.amazonaws.com/pegozegi/hyderabad_chatal_band_naa.pdf
    • http://lukafimagog.atwebpages.com/49874020503.pdf
    • https://s3.amazonaws.com/legipalofi/amazon_audible_books.pdf
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_c39d3b5d23844812a562f97c312969b2.pdf?index=true
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_966f6272098d4957b6c84b163b179d23.pdf?index=true
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_b92ee597c620421a85cfafaf1ada5e93.pdf?index=true
    • 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_off00013701.bin
68c7270d6b41a5a0974b4b4ea53c1c84f852197739ccdc32436501f668b5987f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13701 5324 bytes
font_01_sfnt_off00014900.bin
ff3d56b07379e8acff119aaccf8688a6377e61f7e8e51475db2c431e5ace216c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14900 11324 bytes
font_02_sfnt_off00016f72.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F72 4324 bytes

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