Malicious PDF — malware analysis report

Static analysis result for SHA-256 c082b479b36c8871…

MALICIOUS

PDF

80.4 KB Created: 2021-04-22 20:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ae7fd3c83c1b4095550b43d9f716af04 SHA-1: 28fdcb9617b21be45f0793da32c32ff2d47040d4 SHA-256: c082b479b36c8871c58af09c8fb8c2ae722a19b9215e91afb3bc435f5ca4351a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=how+many+years+is+a+harmony+booster+seat+good+for PDF link annotation
    • https://gijejutet.weebly.com/uploads/1/3/5/9/135974865/503099.pdfIn PDF document text
    • https://rarifipive.weebly.com/uploads/1/3/4/1/134131304/jodudamijelir.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/ruger_mini_14_10_round_magazine_amazon.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/bulk_density.pdfIn PDF document text
    • http://cashthe.ru/654323701440hqvm.pdfIn PDF document text
    • https://xuwudivalef.weebly.com/uploads/1/3/4/8/134889087/703031be1.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/81681455334.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/litaturaxibumupugem8th10.pdfIn 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://s3.amazonaws.com/jujadodedaruxix/ralufipupoxixalaxasosuxag.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/59493707210.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/31005234694.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/sample_accomplishment_report_in_reading.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_64cc6b1237e4480db7a80909ece22499.pdf?index=trueIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_d5aa49e87c7c41b1a05147d3461e3899.pdf?index=trueIn PDF document text
    • http://lonesopuw.onlinewebshop.net/practical_flow_cytometry_shapiro.pdfIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_c3200724370c493890ce429d4304bb5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/15470295083.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/zusenedosobegipebekokejok.pdfIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_951580a6ac9446e8974664f54e3a3bbc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/70628595552.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 5372 bytes
SHA-256: 927420015650b40a9fd931ec09f10970b63f4892f2b890b563e4c84b84795048
font_01_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 10380 bytes
SHA-256: 0501742b6f5292723eba05f1a7e44c4fd9c8e73ea0c8ab60a6988f972ec11060
font_02_sfnt_off00012592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12592 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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