Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0535053b9050ae…

MALICIOUS

PDF

77.3 KB Created: 2021-03-29 21:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 907a32f3ad0833a10634418b4b552238 SHA-1: 5fc1e0d7071231b0eaf9134b7988fe2cb3b8bc54 SHA-256: 8d0535053b9050aecd79f5be21388164f8ef4e770d56778786899d9ac666c42f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=tesis+de+estadistica+descriptiva.+pdf PDF link annotation
    • http://nirenodeba.medianewsonline.com/effective_nuclear_charge_trend.pdfIn PDF document text
    • https://raxopukefafifi.weebly.com/uploads/1/3/2/6/132695755/b5c636dcbf4a.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/case_interview_secrets_a_former_mckinsey_interviewer.pdfIn PDF document text
    • https://wemezixogasowed.weebly.com/uploads/1/3/1/6/131637562/7119697.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_ef0dc7fa520c4c6189ea93f6ad4556a2.pdf?index=trueIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_47e7fb8b7cd44e33adfbdd78d8cc9de4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najipavez/debit_and_credit_spreadsheet.pdfIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_4df0a6d7e4c0402a825f459b7b9a0b84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/99309846290.pdfIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_7ee65145a3a14534977147abd23a3c87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/725414449.pdfIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_56671195d8884f28b2b63c7ae5a479c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/how_long_charge_beats_solo_3.pdfIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_96e0779a79f44ae09de463a0847236c5.pdf?index=trueIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_766283ca683a438a8fc04654ebeeeeb9.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_b595da9008b947efb3e131110b7be576.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/gaali_chirugaali_video_song_free.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 5156 bytes
SHA-256: cb6790a56d81e33e82ab97f8ee9c7b87799c25e4b5602ac2ac8ef32bcdbb017f
font_01_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 12016 bytes
SHA-256: 9be98133dfe90eacceb4cf5cca17cdf00d05daa26c3e860dc4eaa87f509f957b

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