Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7f86ca95d81389…

MALICIOUS

PDF

43.0 KB Created: 2020-07-09 09:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 2ecf63fe2cbbf02edca9ab439e0397f6 SHA-1: 1348ba4039ceb616090065ca27b3b878694d5c46 SHA-256: 5b7f86ca95d813896c3ac1eaf7150052e23f1f4c0aa25e2f45f3cb2c0212b91c
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it functions as a dropper. It contains a large number of embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of a link to a known malicious redirector further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-8990975-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8990975-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ttraff.com/wb?keyword=united%20states%20government%20democracy%20in%20action%20pdf%20chapter%2014 In PDF document text
    • http://files.brentwoodbayvet.com/uploads/1/3/0/7/130739780/jakilolabus.pdfIn PDF document text
    • http://files.airmicrochip.com/uploads/1/3/0/7/130775902/nenexim.pdfIn PDF document text
    • http://files.jjartmedia.com/uploads/1/3/2/6/132695994/tuzemutobogo.pdfIn PDF document text
    • http://files.merarifernandez.com/uploads/1/3/1/4/131407165/6839308.pdfIn PDF document text
    • http://files.mediterraneanmomma.com/uploads/1/3/2/7/132712326/pazasizevuwegu.pdfIn PDF document text
    • http://files.davesartdimensions.com/uploads/1/3/1/6/131606348/vojetiborakupo.pdfIn PDF document text
    • http://files.southernhillsbiblechurch.org/uploads/1/3/1/4/131438150/koromabenedas.pdfIn PDF document text
    • http://files.divine-pet-services.com/uploads/1/3/0/7/130775846/roketonosukezasufit.pdfIn PDF document text
    • http://files.treblemakers.ie/uploads/1/3/1/4/131438024/tukexotodok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://mawumobu.files.wordpress.com/2020/07/mivedejejarisiweguda.pdfIn PDF document text
    • https://sunoripe23167673.files.wordpress.com/2020/07/lalopegumukotigibik.pdfIn PDF document text
    • https://jotunajaf.files.wordpress.com/2020/07/komisimejazodol.pdfIn PDF document text
    • https://padububoxu.files.wordpress.com/2020/06/biboruxupibax.pdfIn PDF document text
    • https://zafuwuma.files.wordpress.com/2020/06/55295949248.pdfIn PDF document text
    • https://jorerego.files.wordpress.com/2020/07/kepofil.pdfIn PDF document text
    • https://lawivomeru.files.wordpress.com/2020/06/bifinijidavujozore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12509012650.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86399573169.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94662163826.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72710717911.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_off00005d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D55 3184 bytes
SHA-256: 97560ea701d480278f5160e3bc33b12ae9d8068c721827351261d2cd488cf2c5
font_01_sfnt_off000068aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68AA 5620 bytes
SHA-256: f69a89a3c69730373f6d616cac030a511c24c19ccbe07f283a7188db647cf0ef
font_02_sfnt_off00007bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAE 9992 bytes
SHA-256: 6acf3b705248ce6e5f1733c0514ccd93dd17e9f07e1da60e936a83293e38e1c0